From Wikipedia, the free encyclopedia
.^ Leap year days in febuary? WikiAnswers  How many days are in a leap year 10 January 2010 11:57 UTC wiki.answers.com [Source type: General]
^ Go there at http://en.wikipedia.org/wiki/Leap_year Let's read what Wikipedia says about Leap Year and Leap Day: "A leap year (or intercalary year) is a year containing one or more extra days (or, in the case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. CLICKING ON THE WEB: Leap Day is past but Leap Year bounds ahead 10 January 2010 11:57 UTC hometownsource.com [Source type: General]
^ Days ia a leap year? WikiAnswers  How many days are in a leap year 10 January 2010 11:57 UTC wiki.answers.com [Source type: General]
.^ Most years have 365 days, but a leap year has 366 days.
^ So this year for example you would have one extra day and 5 seconds added to February. The science of leap time  Cosmic Log  msnbc.com 10 January 2010 11:57 UTC cosmiclog.msnbc.msn.com [Source type: General]
^ Well, take 365.25 (the quarter day is for the leap year) and multiply by 28 years ... 28 year Calendar! 10 January 2010 11:57 UTC qbx6.ltu.edu [Source type: General]
.^ By occasionally inserting (or intercalating) an additional day or month into the year, the drift can be corrected. Leap Year Math  Googol Learning 10 January 2010 11:57 UTC www.googolpower.com [Source type: General]
 CLICKING ON THE WEB: Leap Day is past but Leap Year bounds ahead 10 January 2010 11:57 UTC hometownsource.com [Source type: General]
 Why Do We Have Leap Year?  Raising A Family 10 January 2010 11:57 UTC www.raisingafamily.net [Source type: General]
^ By occasionally inserting an additional day into the year, the drift can be corrected.
^ Add an additional day once every four years to correct the drift. Inside MyFax: A MyFax Leap Year 10 January 2010 11:57 UTC blog.myfax.com [Source type: General]
.^ The year in which this occurs, is called a Leap Year. Leap Day and Leap Year at Holiday Insights 10 January 2010 11:57 UTC www.holidayinsights.com [Source type: FILTERED WITH BAYES]
^ A year which is not a leap year is called a common year. Leap Year Math  Googol Learning 10 January 2010 11:57 UTC www.googolpower.com [Source type: General]
 Leap year  How and when it happens, February 08  2GB.com 10 January 2010 11:57 UTC www.2gb.com [Source type: General]
 What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
 CLICKING ON THE WEB: Leap Day is past but Leap Year bounds ahead 10 January 2010 11:57 UTC hometownsource.com [Source type: General]
 Why Do We Have Leap Year?  Raising A Family 10 January 2010 11:57 UTC www.raisingafamily.net [Source type: General]
^ Values are: 0 = the year IS NOT a leap year (and therefore is a common year). jewish_leap_year (am) Detail (jwleapyr.js) 10 January 2010 11:57 UTC www.humphreys.org [Source type: FILTERED WITH BAYES]
Gregorian calendar
.^ If a year is divisible by 4 and by 100, it is not a leap year unless it is also divisible. Leap Year  Today's issues  Guardian Unlimited 10 January 2010 11:57 UTC chefgirl.net [Source type: News]
^ Unlike the Gregorian calendar, 2006 was a leap year in the Chinese calendar. Leap Year in Other Calendars 10 January 2010 11:57 UTC www.timeanddate.com [Source type: General]
^ However, if it is evenly divisible by 4 and also evenly divisible by 100 and not further evenly divisible by 400, then it is not a leap year. How To Calculate Leap Years with Perl  Perl 10 January 2010 11:57 UTC www.willmaster.com [Source type: General]
.^ So this year for example you would have one extra day and 5 seconds added to February. The science of leap time  Cosmic Log  msnbc.com 10 January 2010 11:57 UTC cosmiclog.msnbc.msn.com [Source type: General]
^ In fact that takes 365.24 days. Topper Shutt's Blog: Leap Year 10 January 2010 11:57 UTC www.wusa9.com [Source type: General]
^ ISO/ESPP Holding Period365 Days or 12 Months? Leap Year and ISOs  The NASPP Blog 10 January 2010 11:57 UTC www.naspp.com [Source type: General]
.^ However, the length of an actual year is 365.2425 days. Leap year: What is it and when does it happen? 10 January 2010 11:57 UTC www.windows.ucar.edu [Source type: General]
^ In common years, the calendar has 365 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
^ The solar year is about 11 minutes less than 365 days in length. List of Leap Years 10 January 2010 11:57 UTC www.buzzle.com [Source type: FILTERED WITH BAYES]
.^ Unfortunately, this is not the case in 2100 because it isn't divisible by 400 so it is not a leap year!
^ If a year is divisible by 4 and by 100, it is not a leap year unless it is also divisible. Leap Year  Today's issues  Guardian Unlimited 10 January 2010 11:57 UTC chefgirl.net [Source type: News]
^ Every year divisible by 4 is a leap year But every year divisible by 100 is NOT a leap year Unless the year is also divisible by 400, then it is still a leap year. February 29, 2008 Is Leap Day!  Scholastic.com 10 January 2010 11:57 UTC www2.scholastic.com [Source type: General]
^{[1]}^{[2]} .^ (That means 1600 was a leap year, but not 1700, 1800 and 1900. Leaping Lizards, It’s Leap Year! at Ray Fowler .org 10 January 2010 11:57 UTC www.rayfowler.org [Source type: FILTERED WITH BAYES]
^ Don't forget, 1900, 1800, and 1700 were each not leap years. ITinfo: Feb 29: A Leap Year Computer Snag? 10 January 2010 11:57 UTC itrain.org [Source type: General]
^ Thus, 1600 was a leap year; 1700, 1800, and 1900 were not, but 2000 will be. Leap Year FAQ 10 January 2010 11:57 UTC incompetech.com [Source type: News]
.^ List of Leap Years in 2200 . List of Leap Years 10 January 2010 11:57 UTC www.buzzle.com [Source type: FILTERED WITH BAYES]
^ This means that the year 2000 was a leap year and 2400 will also be one, but 1800 and 1900 were not leap years, and the years 2100 , 2200 , and 2300 will not be leap years either ... *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ So the year 2000 was a leap year, but the years 2100, 2200 and 2300 will not be.
.^ Each year actually includes, besides the 365 days, an extra 5 hours, 49 minutes and 12 seconds.
^ This results in an average year of 365.24 days.
^ If it was .6 seconds per year the day would have lengthen by 1 minute and 40 seconds since 1820. The science of leap time  Cosmic Log  msnbc.com 10 January 2010 11:57 UTC cosmiclog.msnbc.msn.com [Source type: General]
.^ "The Gregorian calendar was designed to keep the vernal equinox on or close to March 21, so that the date of Easter (celebrated on the Sunday after the 14th day of the Moon that falls on or after 21 March) remains correct with respect to the vernal equinox. CLICKING ON THE WEB: Leap Day is past but Leap Year bounds ahead 10 January 2010 11:57 UTC hometownsource.com [Source type: General]
^ It also dropped several days from the caled several days from the calendar so that the vernal equinox was brought back to March 21. The Calendar, Leap Years and the Year 2000 AD 10 January 2010 11:57 UTC chemistry.csudh.edu [Source type: FILTERED WITH BAYES]
^ This new version was designed with the goal of keeping the vernal equinox on or close to March 21. Inside MyFax: A MyFax Leap Year 10 January 2010 11:57 UTC blog.myfax.com [Source type: General]
a
.^ The dropping of 10 days from the calendar made the Vernal Equinox fall on March 21. Leap Year Isn't a Bust  Ted Pedas, YSU Planetarium Lecturer 10 January 2010 11:57 UTC www.farrellareaschools.com [Source type: General]
^ "The Gregorian calendar was designed to keep the vernal equinox on or close to March 21, so that the date of Easter (celebrated on the Sunday after the 14th day of the Moon that falls on or after 21 March) remains correct with respect to the vernal equinox. CLICKING ON THE WEB: Leap Day is past but Leap Year bounds ahead 10 January 2010 11:57 UTC hometownsource.com [Source type: General]
^ This may not seem like a lot, but over the course of centuries it added up, until in the 16th century, the vernal equinox was falling around March 11 instead of March 21. Leap Year Explained — Infoplease.com 10 January 2010 11:57 UTC www.infoplease.com [Source type: General]
^{[3]} .^ In the long term, it is accurate to about one day in 2500 years. Leap Year in Other Calendars 10 January 2010 11:57 UTC www.timeanddate.com [Source type: General]
^ In common years, the calendar has 365 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
^ The length of the vernal tropical year is 365.24237 days. Leap years and leap seconds : Time fact files : Astronomy & time : Explore online : NMM 10 January 2010 11:57 UTC www.nmm.ac.uk [Source type: FILTERED WITH BAYES]
.^ Compared with the Gregorian calendar, which errors by one day in about every 3226 years, the Iranian calendar needs a oneday correction in about every 141,000 years. Leap Year in Other Calendars 10 January 2010 11:57 UTC www.timeanddate.com [Source type: General]
^ Everyone understands that the Gregorian calendar will be off by about a day in 3000 years or so. Leap Year FAQ 10 January 2010 11:57 UTC incompetech.com [Source type: News]
^ You can have one day a year." February 29@Everything2.com 10 January 2010 11:57 UTC everything2.com [Source type: General]
.^ But in 8,000 years, the length of the vernal equinox year will have changed by an amount which cannot be accurately predicted (see below). CLICKING ON THE WEB: Leap Day is past but Leap Year bounds ahead 10 January 2010 11:57 UTC hometownsource.com [Source type: General]
^ The solar year, the time it take the sun to appear directly over the equator (Vernal Equinox) and then reappear takes a bit over one year. Topper Shutt's Blog: Leap Year 10 January 2010 11:57 UTC www.wusa9.com [Source type: General]
^ The only hitch is that the current calendar may need an overhaul a few thousand years from now due to the changing length of the year at the equator. LET'S HEAR IT FOR LEAP YEAR! 10 January 2010 11:57 UTC www.squidoo.com [Source type: General]
.^ Unlike the Gregorian calendar, 2006 was a leap year in the Chinese calendar. Leap Year in Other Calendars 10 January 2010 11:57 UTC www.timeanddate.com [Source type: General]
^ The purpose of a leap year is to align the calendar year with the astronomical year. What's the point of leap year? 10 January 2010 11:57 UTC ask.yahoo.com [Source type: General]
^ According to the Gregorian calendar, there are 3 rules to calculate if it is leap year or not a leap year. Teaching About Leap Year 2008: Classroom Activities to Explain the Extra Day in February 10 January 2010 11:57 UTC classroomactivities.suite101.com [Source type: News]
.^ Improve ] Unlike a normal year a leap year is 366 days due to the fact that a year is acually 365.25 days in a normal year so ever time a year goes by it adds up like 365.25 then 365.50 then 365.75 then finally 366 then back around. WikiAnswers  How many days are in a leap year 10 January 2010 11:57 UTC wiki.answers.com [Source type: General]
^ Since the tropical year is 365.242190 days long, a leap year must be added roughly once every four years (four times the fractional day gives ). Leap Year  from Eric Weisstein's World of Astronomy 10 January 2010 11:57 UTC scienceworld.wolfram.com [Source type: FILTERED WITH BAYES]
^ Fact: In 1288, Scotland established Leap Day as a time when a woman could propose marriage to a man. 11 Things: Leap year  SFGate 10 January 2010 11:57 UTC articles.sfgate.com [Source type: News]
See Iranian calendar to contrast with a calendar based on 8 leap days every 33 years. 
Algorithm
Pseudocode to determine whether a year is a
leap year or
not:
if year modulo 400 is 0
then is_leap_year
else if year modulo 100 is 0
then not_leap_year
else if year modulo 4 is 0
then is_leap_year
else
not_leap_year
A more direct algorithm:
if (year modulo 4 is 0) and (year modulo 100 is not 0) or (year modulo 400 is 0)
then is_leap_year
else
not_leap_year
.^ For this reason, the following years are not leap years: 1700, 1800, 1900, 2100, 2200, 2300, 2500, 2600 This is because they are evenly divisible by 100 but not by 400. Method to determine whether a year is a leap year 10 January 2010 11:57 UTC support.microsoft.com [Source type: General]
^ While that might work, it adds more complexity to the algorithm and makes it harder to follow. Leap year and the Zune  And now it's all this 10 January 2010 11:57 UTC www.leancrew.com [Source type: General]
^ DAY BY DAY Day by day, O dear Lord, Three things I pray: To see Thee more clearly, Love Thee more dearly, Follow Thee more nearly, Day by day. A New Day ; Leap Year 10 January 2010 11:57 UTC 216.117.216.152 [Source type: Original source]
.^ "A century year, that is, a year which ends in two zeroes 1800 , 1900 , 2000 , etc., is not a leap year unless it is also evenly divisible by 400. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ Expressed in pseudocode: If ((year modulo 4 is 0) and (year modulo 100 is not 0)) or (year modulo 400 is 0) Then leapYear = true Else leapYear = false End if .
^ However, if it is evenly divisible by 4 and also evenly divisible by 100 and not further evenly divisible by 400, then it is not a leap year. How To Calculate Leap Years with Perl  Perl 10 January 2010 11:57 UTC www.willmaster.com [Source type: General]
.^ "A century year, that is, a year which ends in two zeroes 1800 , 1900 , 2000 , etc., is not a leap year unless it is also evenly divisible by 400. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ In this calendar, every fourth year is a leap year except century years that are not divisible by 400. What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
^ The Gregorian reform to the calendar altered the rule for determining if a year should be a leapyear by stating that centenary years should only be leapyears if they were divisible by 400. The Calendar, Leap Years and the Year 2000 AD 10 January 2010 11:57 UTC chemistry.csudh.edu [Source type: FILTERED WITH BAYES]
4 
100 
400 

(4 and not 100) or 400 
4 and (not 100 or 400) 
T 
T 
T 

T 
T 
T 
T 
F 

F 
F 
T 
F 
F 

T 
T 
F 
F 
F 

F 
F 
Leap day
Main article:
February 29
A pocket calendar from the year
2008 showing February 29
.^ How many days are in a leap year? WikiAnswers  How many days are in a leap year 10 January 2010 11:57 UTC wiki.answers.com [Source type: General]
^ A year which has a February 29 is, by definition, a leap year . *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ Why is every fourth year called a 'leap year?' What year is the next leap year? 10 January 2010 11:57 UTC www.funtrivia.com [Source type: General]
.^ A leap year has 366 days, vs a nonleap year which has 365. Leap year?  Yahoo! Answers 10 January 2010 11:57 UTC answers.yahoo.com [Source type: General]
^ When does leap year occur? Time, Weights, and Measures  When Does Leap Year Occur?: Science Fact Finder 10 January 2010 11:57 UTC www.enotes.com [Source type: FILTERED WITH BAYES]
^ Leap year days in febuary? WikiAnswers  How many days are in a leap year 10 January 2010 11:57 UTC wiki.answers.com [Source type: General]
.^ This calendar was used before the Gregorian calendar was adopted. The Leap Year and Leap Day  February 29 10 January 2010 11:57 UTC www.timeanddate.com [Source type: News]
 CodeProject: Is it Leap Year? ....Using Javascript.. Free source code and programming help 10 January 2010 11:57 UTC www.codeproject.com [Source type: General]
 What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
^ We use the Gregorian Calendar today. LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
^ Besides the Julian and Gregorian calendars, what other calendars have been used? Time, Weights, and Measures  When Does Leap Year Occur?: Science Fact Finder 10 January 2010 11:57 UTC www.enotes.com [Source type: FILTERED WITH BAYES]
.^ Here’s the history: The Romans originally had a 355day calendar. LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
^ The Roman calendar had 355 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
^ Later, when Julius Caesar reformed the calendar, and instituted the practice of an additional day every four years, he decreed the sixth day before the Kalendae of March be doubled. The Old Joel on Software Forum  Leap Year Date Problems 10 January 2010 11:57 UTC discuss.fogcreek.com [Source type: General]
.^ Today is one of those days. Collider 10 January 2010 11:57 UTC www.collider.com [Source type: FILTERED WITH BAYES]
^ Instead of having a single leap day every four years (as we do now) the Egyptians allowed the onequarter day accumulate. humor To Leap Or No?: The Story of Leap Year  Humor Computers & Internet 10 January 2010 11:57 UTC www.bytebackonline.com [Source type: General]
^ Each 29.5day cycle amounted to one month, and the first versions counted only 10 months in a year. Leaping Lizards, It’s Leap Year! at Ray Fowler .org 10 January 2010 11:57 UTC www.rayfowler.org [Source type: FILTERED WITH BAYES]
.^ After 100 years, the calendar would be off by about 24 days. What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
^ This calendar was used before the Gregorian calendar was adopted. The Leap Year and Leap Day  February 29 10 January 2010 11:57 UTC www.timeanddate.com [Source type: News]
 What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
^ The Roman calendar had 355 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
d. VI Kal. Mar.
.^ The Roman calendar had 355 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
^ The modern 365day calendar is based on the time it takes for the Earth to revolve around the sun. Leap year trips up computers  MassLive.com 10 January 2010 11:57 UTC www.masslive.com [Source type: News]
^ Every second year, the Roman calendar included an > extra month called Mercedonius of 22 or 23 days to keep up with the > solar year.
^{[4]}
.^ Rome had been following a calendar that first had 10 months of 304 days. Leap Year Isn't a Bust  Ted Pedas, YSU Planetarium Lecturer 10 January 2010 11:57 UTC www.farrellareaschools.com [Source type: General]
^ Every second year, the Roman calendar included an > extra month called Mercedonius of 22 or 23 days to keep up with the > solar year.
^ Leap years, in which we add a day every 4 years, don't account completely for the discrepancies between reality and our arbitrary calendar Every so often, a second has to be added. Zune chokes on leapyear bug  Macworld Forums 10 January 2010 11:57 UTC forums.macworld.com [Source type: FILTERED WITH BAYES]
d. VII Kal. Mar., February 23). The remaining days of Februarius were dropped.
.^ A leap year (or intercalary year) is a year containing one or more extra days (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronized with the astronomical or seasonal year. Leap Year Math  Googol Learning 10 January 2010 11:57 UTC www.googolpower.com [Source type: General]
^ Therefore, the Romans introduced an extra month at no additional charge called Mercedonius, which contained 22 or 23 days and was added every second year. humor To Leap Or No?: The Story of Leap Year  Humor Computers & Internet 10 January 2010 11:57 UTC www.bytebackonline.com [Source type: General]
^ "Year containing some intercalary period, especially a Gregorian year having a 29th day of February instead of the standard 28 days. LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
.^ Do you celebrate on the last day of February, because that's when you were born??? Honor Society of Leap Year Day Babies 10 January 2010 11:57 UTC feb29.leapyearday.com [Source type: General]
^ Science Videos More Science Videos » We all know that February is a funny month  every four years it has one extra day (February 29) instead of the normal 28 days. HowStuffWorks "How could the year 2000 be a leap year when 1900 was not?" 10 January 2010 11:57 UTC science.howstuffworks.com [Source type: News]
^ Linguistics also play a part here  why “leap?” The proper term for the inserted day apparently is an “intercalary day”, but it results in all celebrated festivals “leaping” one day forward .
.^ The Roman calendar had 355 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
^ Therefore, as the hours accumulated over the centures, an extra day was occasionally added to the calendar, and over time the practice became more or less official. Leap Year Trivia, Leap Day Fun Facts & History 10 January 2010 11:57 UTC www.chiff.com [Source type: General]
^ Every second year, the Roman calendar included an > extra month called Mercedonius of 22 or 23 days to keep up with the > solar year.
.^ Julius caesar created the modern calendar in 46 bc, which is distinct from the astronomer’s Julian calendar . leap year : Java Glossary 10 January 2010 11:57 UTC mindprod.com [Source type: FILTERED WITH BAYES]
^ Julius Caesar added 30 and 31 days to consecutive months. List of Leap Years 10 January 2010 11:57 UTC www.buzzle.com [Source type: FILTERED WITH BAYES]
^ The Roman calendar had 355 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
.^ A leap year (or intercalary year) is a year containing one or more extra days (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronized with the astronomical or seasonal year. Leap Year Math  Googol Learning 10 January 2010 11:57 UTC www.googolpower.com [Source type: General]
^ The Gregorian calendar is closely based on the Julian calendar, which was introduced by Julius Caesar in 45 BC. The Julian calendar featured a 12month, 365day year, with an intercalary day inserted every fourth year at the end of February to make an average year of 365.25 days. Leap Year Explained — Infoplease.com 10 January 2010 11:57 UTC www.infoplease.com [Source type: General]
^ February was further despoiled by Augustus Caesar who also purloined a day so as to make `his' month, August, also have 31 days. The Calendar, Leap Years and the Year 2000 AD 10 January 2010 11:57 UTC chemistry.csudh.edu [Source type: FILTERED WITH BAYES]
.^ The leap day is inserted in the days of Ayyamiha , a period of intercalary days devoted to fasting preparations, hospitality, charity and giftgiving from February 26 to March 1. Leap Year in Other Calendars 10 January 2010 11:57 UTC www.timeanddate.com [Source type: General]
^ "Year containing some intercalary period, especially a Gregorian year having a 29th day of February instead of the standard 28 days. LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
^ February 29 LEAP Year  LEAP Day © 19952008 Leap Day (February 29th) @ February 29 LEAP Year  LEAP Day (an extra day / 24 hours / 1440 minutes / 86,400 seconds) Why??? LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
.^ Therefore, the Romans introduced an extra month at no additional charge called Mercedonius, which contained 22 or 23 days and was added every second year. humor To Leap Or No?: The Story of Leap Year  Humor Computers & Internet 10 January 2010 11:57 UTC www.bytebackonline.com [Source type: General]
^ So every 400 years, we DON'T NOT add the extra day (double negative intended). The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
^ So, if calendar years contained 365 days they would drift from the actual year by about 1 day every 4 years. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
.^ A person born on February 29 may we call a leapling and none leap years these people celebrate their birthdays on the last day of February or the first day of March. What Is a Leap Year Video – 5min.com 10 January 2010 11:57 UTC www.5min.com [Source type: FILTERED WITH BAYES]
^ But if there's a February 29 between the two dates, the day of the week "leaps" forward an extra day: January 1, 2009, will be on a Thursday (instead of Wednesday). February 29, 2008 Is Leap Day!  Scholastic.com 10 January 2010 11:57 UTC www2.scholastic.com [Source type: General]
^ Still not exact, but the calendar year won't vary by more than a day from its current place in the seasonal (astronomical) year in two hundred centuries  close enough for practical purposes. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
d. VI, V, IV, III and pridie Kal. Mar. (which would be those days numbered 24, 25, 26, 27, and 28 from the beginning of February in a common year), i.e. the intercalated day was the first half of the doubled day. All later writers, including
Macrobius about 430,
Bede in 725, and other medieval
computists (calculators of
Easter), continued to state that the bissextum (bissextile day) occurred before the last five days of February.
.^ The reform was accepted, immediately in most Roman Catholic countries, more gradually in Protestant countries, and in the Eastern Church the Julian calendar was retained into the 20th cent. Leap Year FAQ 10 January 2010 11:57 UTC incompetech.com [Source type: News]
^ St Matthias moves (for Roman Catholics) from Feb 24 to Feb 25. Merlyn  Leap Years  J R Stockton 10 January 2010 11:57 UTC www.merlyn.demon.co.uk [Source type: FILTERED WITH BAYES]
^ Feast day (alternate) of Pope St Hilarius , 46 th Roman Catholic pope , from 461 to 468 ; commemorated today or February 28 . *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
d. VI Kal.
.^ In common years, the calendar has 365 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
^ There are 29 days this year in the month of February. Leap year?  Yahoo! Answers 10 January 2010 11:57 UTC answers.yahoo.com [Source type: General]
^ In a leap year an extra day is added to the month of February. This is Leap Year  Marriage  Families.com 10 January 2010 11:57 UTC marriage.families.com [Source type: General]
d. VI Kal. Mar. shifted the latter day to February 25 in leap years, with the
Vigil of St. Matthias shifting from February 23 to the leap day of February 24. Other feasts normally falling on February 25–28 in common years are also shifted to the following day in a leap year (although they would be on the same day according to the Roman notation).
.^ Many countries, especially in Asia still use such calendars. The Leap Year and Leap Day  February 29 10 January 2010 11:57 UTC www.timeanddate.com [Source type: News]
^ So, still, there are some who, in this way, are "born out of due time," through the Holy Spirit's use even of the preacher's weakness and apparent failure. A Leap Year Sermon 10 January 2010 11:57 UTC www.spurgeon.org [Source type: Original source]
^ (Footnote: The Russian Orthodox Church still uses the Julian calendar. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
Julian, Coptic and Ethiopian calendars
.^ In common years, the calendar has 365 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
^ The 1/4 part adds up to a whole day every four years. WikiAnswers  Why is there a leap year 10 January 2010 11:57 UTC wiki.answers.com [Source type: General]
^ This extra day is added to the calendar on February 29th. NIST Time and Frequency FAQ 10 January 2010 11:57 UTC tf.nist.gov [Source type: FILTERED WITH BAYES]
.^ A year which has a February 29 is, by definition, a leap year . *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ By adopting a leap year with an extra day every four years, the calendar year would drift much less. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ So every 400 years, we DON'T NOT add the extra day (double negative intended). The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
.^ This results in an average year of 365.24 days.
^ And that gives us an average of 365.24225 days per year over a 4.000 year period. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
^ If a leap day is added every fourth year, the average length of the calendar year is 365.25 days. Leap year?  Yahoo! Answers 10 January 2010 11:57 UTC answers.yahoo.com [Source type: General]
.^ Some years are longer than others. ok50.com  Top 50 Leap Year Facts, our Leap Year feature is full of ideas and offers to get your man! 10 January 2010 11:57 UTC www.ok50.com [Source type: General]
^ The Romans however, still based months on the moon cycles which was 11 days off of the actual year and they ended up 80 days off on their schedule. The Leap Year Demystified  Popular Science 10 January 2010 11:57 UTC www.popsci.com [Source type: General]
^ We've made the calendar year longer than it ought to be. Calendars and Leap Years  Loren on the Art of MATLAB 10 January 2010 11:57 UTC blogs.mathworks.com [Source type: General]
.^ This means that the calendar will not be off by a full day until the year 4915 A.D. .
^ After every 128 years, that was a full day. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
^ In common years, the calendar has 365 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
Revised Julian calendar
.^ In this calendar, every fourth year is a leap year except century years that are not divisible by 400. What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
^ A year which has a February 29 is, by definition, a leap year . *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ By adopting a leap year with an extra day every four years, the calendar year would drift much less. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
.^ This results in an average year of 365.24 days.
^ And that gives us an average of 365.24225 days per year over a 4.000 year period. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
^ The length of a seasonal year is 365.24219878 days (more or less). Calendars and Leap Years  Loren on the Art of MATLAB 10 January 2010 11:57 UTC blogs.mathworks.com [Source type: General]
This is a very good approximation to the
mean tropical year, but because the
vernal equinox year is slightly longer, the Revised Julian calendar does not do as good a job as the Gregorian calendar of keeping the vernal equinox on or close to March 21.
Chinese calendar
.^ 'Leap Year Day was added to the calendar when February was the last month of the year. babyworld  your baby  special events  leap year babies 10 January 2010 11:57 UTC www.babyworld.co.uk [Source type: General]
^ The years that are not leap years are called common years. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
^ A year which is not a leap year is called a common year. What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
.^ According to the Gregorian calendar, there are 3 rules to calculate if it is leap year or not a leap year. Teaching About Leap Year 2008: Classroom Activities to Explain the Extra Day in February 10 January 2010 11:57 UTC classroomactivities.suite101.com [Source type: News]
^ Sometimes, however, a "leap month" is added to keep the calendar from drifting. What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
^ 'Leap Year Day was added to the calendar when February was the last month of the year. babyworld  your baby  special events  leap year babies 10 January 2010 11:57 UTC www.babyworld.co.uk [Source type: General]
.^ A Leap Year (or intercalary year) is a year containing one or more extra days (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. 2008 A Leap Year  Eyedea Lab 10 January 2010 11:57 UTC www.eyedealab.com [Source type: FILTERED WITH BAYES]
^ The second change was to reform the calendar to prevent slippage in the future; and we use that same calendar system today, called the Gregorian. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
^ Leap into the unknown: Simply clear your diary and leave the day wide open to do whatever the mood takes you  and enjoy! February 29th: Your leapyear day extravaganza  Telegraph 10 January 2010 11:57 UTC www.telegraph.co.uk [Source type: General]
Hebrew calendar
.^ A Leap Year (or intercalary year) is a year containing one or more extra days (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. 2008 A Leap Year  Eyedea Lab 10 January 2010 11:57 UTC www.eyedealab.com [Source type: FILTERED WITH BAYES]
^ The solar year does not have a whole number of lunar months either, so a lunisolar calendar must have a variable number of months in a year. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ The Hebrew calendar is lunar, and it periodically inserts extra months to make up the shortfall. Calendars and Leap Years  Loren on the Art of MATLAB 10 January 2010 11:57 UTC blogs.mathworks.com [Source type: General]
.^ After 3 years, such a lunar calendar would be off by a whole month, so the Assyrians added an extra month from time to time to keep their calendar in synchronization with the seasons. HP OpenVMS systems  Year 2000 10 January 2010 11:57 UTC h71000.www7.hp.com [Source type: FILTERED WITH BAYES]
 Leap Year Explained 10 January 2010 11:57 UTC www.educyberpg.com [Source type: FILTERED WITH BAYES]
^ This extra day was added to the month of February because it was the shortest month in the year already. Leap Year History & Cartoon Fun from Brownielocks. 10 January 2010 11:57 UTC www.brownielocks.com [Source type: General]
^ These six hours added up to roughly one full extra day every four years, so it was tacked on to the end of February, every socalled bissextile year. Leap year babies forever young 10 January 2010 11:57 UTC www.canada.com [Source type: News]
.^ A leap month is added 7 times out of every 19 years. What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
^ Since the Jewish holidays are supposed to be seasonrelated (they were originally harvest festivals), the calendar adjusts by adding a whole month about every three years  actually, 7 times every 19 years. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
^ The Jewish calendar is based on a lunar cycle  that is, each month is based on the interval, about 29 or 30 days, from new moon to new moon  so it's short by about 11 days per solar year. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
.^ You can have one day a year." February 29@Everything2.com 10 January 2010 11:57 UTC everything2.com [Source type: General]
^ What Year and day are we in according to the 360 Calendar? Bible Prophecy Calendar: 360 day/year 10 January 2010 11:57 UTC www.360calendar.com [Source type: FILTERED WITH BAYES]
^ In common years, the calendar has 365 days. Once Upon A Leap Year 2008  Lifescript.com 10 January 2010 11:57 UTC www.lifescript.com [Source type: General]
.^ This year it only has 28 days. Leap year?  Yahoo! Answers 10 January 2010 11:57 UTC answers.yahoo.com [Source type: General]
^ The length of the year is 365.242199 days. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ Stuff not related to Leap Year Day . Leap Year Revolution : LEAP THIS 10 January 2010 11:57 UTC www.cafepress.com [Source type: General]
 Mystery of Leap Year solved! : LEAP THIS 10 January 2010 11:57 UTC www.cafepress.com [Source type: General]
.^ The astronomical year, the time taken for the Earth to complete its orbit around the Sun, is about 365.242 days, or, to a first approximation, 365.25 days. leap year (calendar)  Britannica Online Encyclopedia 10 January 2010 11:57 UTC www.britannica.com [Source type: FILTERED WITH BAYES]
^ "Leap Year Day" babies will never have a "Golden Birthday" ! LET'S HEAR IT FOR LEAP YEAR! 10 January 2010 11:57 UTC www.squidoo.com [Source type: General]
^ Leap Year Day will also be Shrove Tuesday in 2028, and Ash Wednesday in 2096. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
This rule is known in Hebrew as "
lo adu rosh" (לא אד"ו ראש), i.e. "Rosh [haShanah, first day of the year] is not Sunday, Wednesday or Friday" (as the Hebrew word adu is written by three
Hebrew letters signifying Sunday, Wednesday and Friday). Accordingly, the first day of
Pesah (Passover) is never Monday, Wednesday or Friday. This rule is known in Hebrew as "
lo badu Pesah", which has a double meaning — "Pesah is not a legend", but also "Pesah is not Monday, Wednesday or Friday" (as the Hebrew word
badu is written by three Hebrew letters signifying Monday, Wednesday and Friday).
One reason for this rule is that
Yom Kippur, the holiest day in the Hebrew calendar, must never be adjacent to the weekly
Sabbath (which is Saturday), i.e. it must never fall on Friday or Sunday, in order not to have two adjacent Sabbath days. However, Yom Kippur can be on Saturday.
.^ Years are 354 or 355 days. Merlyn  Leap Years  J R Stockton 10 January 2010 11:57 UTC www.merlyn.demon.co.uk [Source type: FILTERED WITH BAYES]
^ Each year consists of 12 lunar months. What exactly is a leap year?  Yahoo!7 Answers 10 January 2010 11:57 UTC au.answers.yahoo.com [Source type: General]
^ The Jewish calendar is based on a lunar cycle  that is, each month is based on the interval, about 29 or 30 days, from new moon to new moon  so it's short by about 11 days per solar year. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
.^ Month lengths also differ from Gregorian; 6×31 then 5×30 then 29 or 30 days. Merlyn  Leap Years  J R Stockton 10 January 2010 11:57 UTC www.merlyn.demon.co.uk [Source type: FILTERED WITH BAYES]
^ Years are 354 or 355 days. Merlyn  Leap Years  J R Stockton 10 January 2010 11:57 UTC www.merlyn.demon.co.uk [Source type: FILTERED WITH BAYES]
^ Leap Year Day February 29 . Leap Year Revolution : LEAP THIS 10 January 2010 11:57 UTC www.cafepress.com [Source type: General]
 Mystery of Leap Year solved! : LEAP THIS 10 January 2010 11:57 UTC www.cafepress.com [Source type: General]
.^ Leap Year Day February 29 . Leap Year Revolution : LEAP THIS 10 January 2010 11:57 UTC www.cafepress.com [Source type: General]
 Mystery of Leap Year solved! : LEAP THIS 10 January 2010 11:57 UTC www.cafepress.com [Source type: General]
^ There are 29 days this year in the month of February. Leap year?  Yahoo! Answers 10 January 2010 11:57 UTC answers.yahoo.com [Source type: General]
^ February 29 LEAP DAY  LEAP YEAR . LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
.^ The Jewish calendar is based on a lunar cycle  that is, each month is based on the interval, about 29 or 30 days, from new moon to new moon  so it's short by about 11 days per solar year. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
^ The original Roman 355 day calendar had an extra 22day month every few years to maintain the correct seasonal changes. LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
 ok50.com  It's Leap Year... & You Know What That Means! 10 January 2010 11:57 UTC www.ok50.com [Source type: General]
^ A Leap Year (or intercalary year) is a year containing one or more extra days (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. 2008 A Leap Year  Eyedea Lab 10 January 2010 11:57 UTC www.eyedealab.com [Source type: FILTERED WITH BAYES]
.^ This month gives us an extra day this year. Career Coach: Leap Year Thoughts about Time  AWN  Animation World Network 10 January 2010 11:57 UTC www.awn.com [Source type: General]
^ The Jewish calendar is based on a lunar cycle  that is, each month is based on the interval, about 29 or 30 days, from new moon to new moon  so it's short by about 11 days per solar year. The Straight Dope: Why do we have leap years? 10 January 2010 11:57 UTC www.straightdope.com [Source type: General]
^ The original Roman 355 day calendar had an extra 22day month every few years to maintain the correct seasonal changes. LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
 ok50.com  It's Leap Year... & You Know What That Means! 10 January 2010 11:57 UTC www.ok50.com [Source type: General]
Islamic calendar
.^ Month lengths also differ from Gregorian; 6×31 then 5×30 then 29 or 30 days. Merlyn  Leap Years  J R Stockton 10 January 2010 11:57 UTC www.merlyn.demon.co.uk [Source type: FILTERED WITH BAYES]
^ February 29 LEAP DAY  LEAP YEAR . LEAP YEAR  LEAP DAY @ February 29 10 January 2010 11:57 UTC www.mystro.com [Source type: General]
^ LeapMonth Cycles of the 360day Calendar of the Prophets . Bible Prophecy Calendar: 360 day/year 10 January 2010 11:57 UTC www.360calendar.com [Source type: FILTERED WITH BAYES]
.^ Likewise, the 'normal' 360day year of the Prophetic Calendar adds a 30day leap month at regular intervals, with that year having 3 9 0 days. Bible Prophecy Calendar: 360 day/year 10 January 2010 11:57 UTC www.360calendar.com [Source type: FILTERED WITH BAYES]
^ The solar year does not have whole number of days, but a calendar year must have a whole number of days. *�* Wilson's Almanac free daily ezine  Book of Days  February 29  Leap Year Day bissextile intercalation Sadie Hawkins Day February 29 10 January 2010 11:57 UTC www.wilsonsalmanac.com [Source type: General]
^ The last leap second was added Dec. Leap Year birthdays pose some dilemmas, some funLeap Year birthdays pose some dilemmas, some fun on Feb. 29» The Commercial Appeal 10 January 2010 11:57 UTC www.commercialappeal.com [Source type: News]
Leap months in the Islamic calendar were prohibited in year 10 AH or 632 CE, both in
Muhammad's
Farewell Sermon and in two verses of the
Qur'an revealed in year 10 AH:
.