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From Wikipedia, the free encyclopedia

The month is a unit of time, used with calendars, which was first used and inventedas some natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic months and last approximately 29.53 days. From excavated tally sticks, researchers have deduced that people counted days in relation to the Moon's phases as early as the Paleolithic age. Synodic months, based on the Moon's orbital period, are still the basis of many calendars today, and are used to divide the year.

Contents

Types of months

The following types of months are mainly of significance in astronomy, most of them (but not the distinction between sidereal and tropical months) first recognized in Babylonian lunar astronomy.

Sidereal month

The period of the Moon's orbit as defined with respect to the celestial sphere (of the fixed stars, nowadays the International Celestial Reference Frame (ICRF)) is known as a sidereal month because it is the time it takes the Moon to return to a given position among the stars (Latin: sidus): 27.321661 days (27 d 7 h 43 min 11.5 s). This type of month has been observed among cultures in the Middle East, India, and China in the following way: they divided the sky into 27 or 28 lunar mansions, one for each day of the month, identified by the prominent star(s) in them.

Tropical month

It is customary to specify positions of celestial bodies with respect to the vernal equinox. Because of precession, this point moves back slowly along the ecliptic. Therefore it takes the Moon less time to return to an ecliptic longitude of zero than to the same point amidst the fixed stars: 27.321582 days (27 d 7 h 43 min 4.7 s). This slightly shorter period is known as tropical month; cf. the analogous tropical year of the Sun.

Anomalistic month

The Moon's orbit approximates an ellipse rather than a circle. However, the orientation (as well as the shape) of this orbit is not fixed. In particular, the position of the extreme points (the line of the apsides: perigee and apogee), makes a full circle (lunar precession) in about nine years. It takes the Moon longer to return to the same apsis because it moved ahead during one revolution. This longer period is called the anomalistic month, and has an average length of 27.554551 days (27 d 13 h 18 min 33.2 s). The apparent diameter of the Moon varies with this period, and therefore this type has some relevance for the prediction of eclipses (see Saros), whose extent, duration, and appearance (whether total or annular) depend on the exact apparent diameter of the Moon. The apparent diameter of the full moon varies with the full moon cycle which is the beat period of the synodic and anomalistic month, and also the period after which the apsides point to the Sun again.

Draconic month

Sometimes written 'draconitic' month[citation needed], and also called the nodical month. The orbit of the moon lies in a plane that is tilted with respect to the plane of the ecliptic: it has an inclination of about five degrees. The line of intersection of these planes defines two points on the celestial sphere: the ascending node, when the moon's path crosses the ecliptic as the moon moves into the northern hemisphere, and descending node when the moon's path crosses the ecliptic as the moon moves into the southern hemisphere. The draconic or nodical month is the average interval between two successive transits of the moon through its ascending node. Because of the sun's gravitational pull on the moon, the moon's orbit gradually rotates westward on its axis, which means the nodes gradually rotate around the earth. As a result, the time it takes the moon to return to the same node is shorter than a sidereal month. It lasts 27.212220 days (27 d 5 h 5 min 35.8 s). The plane of the moon's orbit precesses over a full circle in about 18.6 years.

Because the moon's orbit is inclined with respect to the ecliptic, the sun, moon, and earth are in line only when the moon is at one of the nodes. Whenever this happens a solar or lunar eclipse is possible. The name "draconic" refers to a mythical dragon, said to live in the nodes and eat the sun or moon during an eclipse[citation needed].

Synodic month

This is the average period of the Moon's revolution with respect to the sun. The synodic month is responsible for the moon's phases, because the Moon's appearance depends on the position of the Moon with respect to the Sun as seen from the Earth. While the moon is orbiting the earth, the Earth is progressing in its orbit around the Sun. This means that after completing a sidereal month the Moon must move a little farther to reach the new position of the Earth with respect to the Sun. This longer period is called the synodic month (Greek: σὺν ὁδῴ, sun hodō, meaning "with the way [of the sun]"). Because of perturbations in the orbits of the Earth and Moon, the actual time between lunations may range from about 29.27 to about 29.83 days. The long-term average duration is 29.530589 days (29 d 12 h 44 min 2.9 s). The synodic month is used in the Metonic cycle.

Month lengths

Here is a list of the average length of the various astronomical lunar months.[1] These are not constant, so a first-order (linear) approximation of the secular change is provided:

Valid for the epoch J2000.0 (1 January 2000 12:00 TT):

anomalistic month 27.554549878 − 0.000000010390 × y days
sidereal month 27.321661547 + 0.000000001857 × y days
tropical month 27.321582241 + 0.000000001506 × y days
draconic month 27.212220817 + 0.000000003833 × y days
synodic month 29.530588853 + 0.000000002162 × y days

Note: time expressed in Ephemeris Time (more precisely Terrestrial Time) with days of 86,400 SI seconds. y is years since the epoch (2000), expressed in Julian years of 365.25 days. Note that for calendrical calculations, one would probably use days measured in the time scale of Universal Time, which follows the somewhat unpredictable rotation of the Earth, and progressively accumulates a difference with ephemeris time called ΔT.

Calendrical consequences

For more details on this topic, see lunar calendar and lunisolar calendar.

At the simplest level, all lunar calendars are based on the approximation that 2 lunations last 59 days: a 30 day full month followed by a 29 day hollow month — but this is only marginally accurate and quickly needs correction by using larger cycles, or the equivalent of leap days.

Second, the synodic month does not fit easily into the year, which makes constructing accurate, rule-based lunisolar calendars difficult. The most common solution to this problem is the Metonic cycle, which takes advantage of the fact that 235 lunations are approximately 19 tropical years (which add up to not quite 6940 days). However, a Metonic calendar (such as the Hebrew calendar) will drift against the seasons by about 1 day every 200 years.

The problems of creating reliable lunar calendars may explain why solar calendars, having months which no longer relate to the phase of the moon, and being based only on the motion of the sun against the sky, have generally replaced lunar calendars for civil use in most societies.

Months in various calendars

Beginning of the lunar month

The Hellenic calendars, the Hebrew Lunisolar calendar and the Islamic Lunar calendar started the month with the first appearance of the thin crescent of the new moon.

However, the motion of the Moon in its orbit is very complicated and its period is not constant. The date and time of this actual observation depends on the exact geographical longitude as well as latitude, atmospheric conditions, the visual acuity of the observers, etc. Therefore the beginning and lengths of months in these calendars can not be accurately predicted.

While some like the Karaites Jews still rely on actual moon observations, most people use the Gregorian solar calendar.

Julian and Gregorian calendars

The Gregorian calendar, like the Julian calendar before it, has twelve months:

Chronology Alphabetic Days
1 January 31 days
2 February 28 days, 29 in leap years
3 March 31 days
4 April 30 days
5 May 31 days
6 June 30 days
7 July 31 days
8 August 31 days
9 September 30 days
10 October 31 days
11 November 30 days
12 December 31 days

The average month in the Gregorian calendar has a length of 30.4167 days or 4.345 weeks in a non-leap year and 30.5 days or 4.357 weeks in a leap year, or 30.436875 days in a mean Gregorian month overall (365.2425 ÷ 12).

Months existing in the Roman calendar in the past include:

The famous mnemonic Thirty days hath September is the most common way of teaching the lengths of the months in the English-speaking world.

Also, note that the latter 10 months of the year form a pair of 31-30-31-30-31-day cycles.

On top of the knuckles (yellow): 31 days
Between the knuckles (blue): 30 days
February (red) has 28 or 29 days.

The knuckles of the four fingers of one's hand and the spaces between them can be used to remember the lengths of the months. By making a fist, each month will be listed as one proceeds across the hand. All months landing on a knuckle are 31 days long and those landing between them are not. When the knuckle of the index finger is reached (July), go back to the first knuckle (or over to the first knuckle on the other fist, held next to the first) and continue with August. This physical mnemonic has been taught to primary school students for many decades.[2][3]

Calends, nones, and ides

The ides occur on the thirteenth day in eight of the months, but in March, May, July, and October, they occur on the fifteenth. The nones always occur 8 days before the ides, i.e., on the fifth or the seventh. The calends are always the first day of the month.

Badi Calendar - Calendar of the Baha'i Faith

The Baha’i year consists of 19 months of 19 days each (361 days), with the addition of “Intercalary Days” (four in ordinary and five in leap years) between the eighteenth and nineteenth months to adjust the calendar to the solar year. The months are named after the attributes of God. The Baha’i New Year coincides with the March equinox (March 21). The Baha’i Era commenced with the year of the Bab’s declaration (1844 A.D.). Days of the year begin and end at sundown, for example, March 21st starts at sundown on the 20th and ends on the 21st at sundown.

  1. Baha (Splendor) March 21
  2. Jalal (Glory) April 9
  3. Jamal (Beauty) April 28
  4. Azemat (Grandeur) May 17
  5. Nur (Light) June 5
  6. Rahmat (Mercy) June 24
  7. Kalemat (Words) July 13
  8. Kamal (Perfection) August 1
  9. Asma (Names) August 20
  10. Ezzat (Might) September 8
  11. Mishiyyat (Will) September 27
  12. Elm (Knowledge) October 16
  13. Qudrat (Power) November 4
  14. Qual (Speech) November 23
  15. Masa'el (Questions) December 12
  16. Sharaf (Honor) December 31
  17. Sultan (Sovereignty) January 19
  18. Mulk (Dominion) February 7 {Followed by: Ayyám-i-Há [Intercalary Days] February 26 - March 1}
  19. Ala (Loftiness) March 2

[4]

Hebrew Calendar

The Hebrew calendar has 12 or 13 months.

  1. Nisan, 30 days ניסן
  2. Iyyar, 29 days אייר
  3. Sivan, 30 days סיון
  4. Tammuz, 29 days תמוז
  5. Av, 30 days אב
  6. Elul, 29 days אלול
  7. Tishri, 30 days תשרי
  8. Heshvan, 29/30 days חשון
  9. Kislev, 29/30 days כסלו
  10. Tevet, 29 days טבת
  11. Shevat, 30 days שבט
  12. Adar 1, 30 days, intercalary month אדר א
  13. Adar 2, 29 days אדר ב

Adar 1 is only added 7 times in 19 years. In ordinary years, Adar 2 is simply called Adar.

French Republican calendar

This calendar was proposed during the French Revolution, and used by the French government for about twelve years from late 1793. There were twelve months of 30 days each, grouped into three ten-day weeks called décades. The five or six extra days needed to approximate the tropical year were placed after the months at the end of each year. A period of four years ending on a leap day was to be called a Franciade. It began at the autumn equinox:

  • Autumn:
  1. Vendémiaire
  2. Brumaire
  3. Frimaire
  • Winter:
  1. Nivôse
  2. Pluviôse
  3. Ventôse
  • Spring:
  1. Germinal
  2. Floréal
  3. Prairial
  • Summer:
  1. Messidor
  2. Thermidor
  3. Fructidor

Iranian/Persian calendar

The Iranian / Persian calendar, currently used in Iran and Afghanistan, also has 12 months. The Persian names are included in the parentheses.

  1. Farvardin (فروردین)‎, 31 days
  2. Ordibehesht (اردیبهشت)‎, 31 days
  3. Khordad (خرداد)‎, 31 days
  4. Tir (تیر)‎, 31 days
  5. Mordad (مرداد)‎, 31 days
  6. Shahrivar (شهریور)‎, 31 days
  7. Mehr (مهر)‎, 30 days
  8. Aban (آبان)‎, 30 days
  9. Azar (آذر)‎, 30 days
  10. Dey (دی)‎, 30 days
  11. Bahman (بهمن)‎, 30 days
  12. Esfand (اسفند)‎, 29 days, 30 in leap years

Islamic calendar

There are also twelve months in the Islamic calendar. They are named as follows:

  1. Muharram ul Haram (or shortened to Muharram) محرّم
  2. Safar صفر
  3. Rabi`-ul-Awwal (Rabi' I) ربيع الأول
  4. Rabi`-ul-Akhir (or Rabi` al-Tיhaany) (Rabi' II) ربيع الآخر أو ربيع الثاني
  5. Jumaada-ul-Awwal (Jumaada I) جمادى الأول
  6. Jumaada-ul-Akhir (or Jumaada al-Thaany) (Jumaada II) جمادى الآخر أو جمادى الثاني
  7. Rajab رجب
  8. Sha'aban شعبان
  9. Ramadhan رمضان
  10. Shawwal شوّال
  11. Dhul Qadah (or Thou al-Qi`dah) ذو القعدة
  12. Dhul Hijja (or Thou al-Hijjah) ذو الحجة

See the article Islamic calendar for more information on the Islamic calendar.

Bangla / Bangladeshi Calendar

The Bangla Calendar follows solar months and it has six seasons. The months and seasons in the calendar are:

Grishho (Summer)

  1. Baishakh- 31 days
  2. Jyoishtho- 31 days

Borsha (Rainy)

  1. Aashar- 31 days
  2. Shrabon- 31 days

Sharat (Autumn)

  1. Bhadro- 31 days
  2. Aashwin- 30 days

Hemanta (Late Autumn)

  1. Kartik- 30 days
  2. Aghrahayon- 30 days

Sheeth (Winter)

  1. Poush- 30 days
  2. Magh- 30 days

Bashanta (Spring)

  1. Falgoon- 30 days
  2. Chaitra- 30 days (31 days in leap year)

Hindu Calendar

The Hindu Calendar has various systems of naming the months. The months in the lunar calendar are:

  1. Chaitra
  2. Vaishaakha
  3. Jyaishtha
  4. Aashaadha
  5. Shraavana
  6. Bhaadrapada
  7. Aashvayuja
  8. Kaartika
  9. Maargashiirsha
  10. Pausha
  11. Maagha
  12. Phaalguna

These are also the names used in the Indian national calendar for the newly redefined months.

The names in the solar calendar are just the names of the zodiac sign in which the sun travels. They are

  1. Mesha
  2. Vrishabha
  3. Mithuna
  4. Kataka
  5. Simha
  6. Kanyaa
  7. Tulaa
  8. Vrishcika
  9. Dhanus
  10. Makara
  11. Kumbha
  12. Miina

Tamil calendar

  1. Chitirai
  2. Vaikasi
  3. Aani
  4. Aadi
  5. Aavani
  6. Purratasi
  7. Aiypasi
  8. Kaarthigai
  9. Maargazhi
  10. Thai
  11. Maasi
  12. Panguni

Sinhala calendar

The Sinhala calendar is the Buddhist calendar in Sri Lanka with Sinhala names. Each full moon Poya day marks the start of a Buddhist lunar month.[5] The first month is Bak.[6] The Sinhala and Tamil New Year Day is the start of the Hindu solar calendar (usually 14 April), an event unrelated to the Buddhist calendar.

  1. Bak
  2. Vesak
  3. Poson
  4. Esala
  5. Nikini
  6. Binara
  7. Vap
  8. Il (iL)
  9. Unduvap
  10. Duruthu
  11. Navam
  12. Medin

Icelandic/Old Norse calendar

The old Icelandic calendar is not in official use anymore, but some Icelandic holidays and annual feasts are still calculated from it. It has 12 months, broken down into two groups of six often termed "winter months" and "summer months". The calendar is peculiar in that the months always start on the same weekday rather than on the same date. Hence Þorri always starts on a Friday sometime between January 19 and January 25 (Old style: January 9 to January 15), Góa always starts on a Sunday between February 18 and February 24 (Old style: February 8 to February 14).

  • Skammdegi ("Short days")
  1. Gormánuður (mid October - mid November, "slaughter month" or "Gór's month")
  2. Ýlir (mid November - mid December, "Yule month")
  3. Mörsugur (mid December - mid January, "fat sucking month")
  4. Þorri (mid January - mid February, "frozen snow month")
  5. Góa (mid February - mid March, "Góa's month, see Nór")
  6. Einmánuður (mid March - mid April, "lone" or "single month")
  • Náttleysi ("Nightless days")
  1. Harpa (mid April - mid May, Harpa is a female name, probably a forgotten goddess, first day of Harpa is celebrated as Sumardagurinn fyrsti - first day of summer)
  2. Skerpla (mid May - mid June, another forgotten goddess)
  3. Sólmánuður (mid June - mid July, "sun month")
  4. Heyannir (mid July - mid August, "hay business month")
  5. Tvímánuður (mid August - mid September, "two" or "second month")
  6. Haustmánuður (mid September - mid October, "autumn month")

Old English calendar

Like the Old Norse calendar, the Anglo-Saxons had their own calendar before they were Christianized which reflected native traditions and deities. These months were attested by Bede in his work On Chronology written in the 8th Century [7]. His months are probably those as written in the Northumbrian dialect of Old English which he was familiar with. The months were so named after the moon; the new moon marking the end of an old month and start of a new month; the full moon occurring in the middle of the month, after which the month was named.

  1. Æftera Geol monaþ (January, 'After Yule moon’
  2. Sol monaþ (February, 'Returning Sun moon’
  3. Hreð monaþ (March, 'Moon of Hreða’)
  4. Eostur monaþ (April, 'Moon of Eostre’)
  5. Ðrimilce monaþ (May, 'Three milkings moon’)
  6. Ærra Liða monaþ (June, 'Before travelling moon’)
  7. Æftera Liða monaþ (July, 'After travelling moon’)
  8. Weod monaþ (August, 'Weed moon’)
  9. Halig monaþ (September, 'Holy moon’)
  10. Winter fylleð (October, 'Winter fullmoon’) (the start of winter began at the fullmoon and is the origin of Halloween)
  11. Blot monaþ (November, 'Blót moon’)
  12. Ærra Geol monaþ (December, 'Before Yule moon')

Old Hungarian calendar

Historically Hungary used a 12-month calendar that appears to have been zodiacal in nature[8] but eventually came to correspond to the Gregorian months as shown below[9]:

  1. Boldogasszony hava (January, ‘month of the happy/blessed lady’)
  2. Böjtelő hava (February, ‘month of early fasting/Lent’ or ‘month before fasting/Lent’)
  3. Böjtmás hava (March, ‘second month of fasting/Lent’)
  4. Szent György hava (April, ‘St. George’s month)
  5. Pünkösd hava (May, ‘Pentecost month’)
  6. Szent Iván hava (June, ‘St. Ivan’s month’)
  7. Szent Jakab hava (July, ‘St. James’ month’)
  8. Kisasszony hava (August, ‘month of the young lady [Blessed Virgin]’)
  9. Szent Mihály hava (September, ‘St. Michael’s month’)
  10. Mindszent hava (October, ‘all saints month’)
  11. Szent András hava (November, ‘St. Andrew’s month’)
  12. Karácsony hava (December, ‘month of Yule/Christmas’)

Old Egyptian calendar

The ancient civil Egyptian calendar had a year that was 365 days long and was divided into 12 months of 30 days each, plus 5 extra days (epagomenes) at the end of the year. The months were divided into 3 "weeks" of ten days each. Because the ancient Egyptian year was almost a quarter of a day shorter than the solar year and stellar events "wandered" through the calendar, it is referred to as Annus Vagus or "Wandering Year".

  1. Thout
  2. Paopi
  3. Hathor
  4. Koiak
  5. Tooba
  6. Emshir
  7. Paremhat
  8. Paremoude
  9. Pashons
  10. Paoni
  11. Epip
  12. Mesori

Nisga'a calendar

The Nisga'a Calendar coincides with the Gregorian Calendar with each month referring to the type of Harvesting that is done during the month.[citation needed]

  1. K'aliiyee = Going North - referring to the Sun returning to its usual place in the sky
  2. Buxwlaks = Needles Blowing About - February is usually a very windy month in the Nass River Valley
  3. Xsaak = To Eat Oolichans - Oolichans are harvested during this month
  4. Mmaal = Canoes - The river has defrosted, hence canoes are used once more
  5. Yansa'alt = Leaves are Blooming - Warm weather has arrived and leaves on the trees begin to bloom
  6. Miso'o = Sockeye - majority of Sockeye Salmon runs begin this month
  7. Maa'y = Berries - berry picking season
  8. Wii Hoon = Great Salmon - referring to the abundance of Salmon that are now running
  9. Genuugwwikw = Trail of the Marmot - Marmots, Ermines and animals as such are hunted
  10. Xlaaxw = To Eat Trout - trout are mostly eaten this time of year
  11. Gwilatkw = To Blanket - The earth is "blanketed" with snow
  12. Luut'aa = Sit In - the Sun "sits" in one spot for a period of time

Rhyme

Month belongs to the handful of words which do not rhyme in the English language.[citation needed]

See also

Notes

  1. ^ Derived from ELP2000-85: M. Chapront-Touzé, J. Chapront (1991): Lunar tables and programs from 4000 B. C. to A. D. 8000. Willmann-Bell, Richmond VA; ISBN 0-943396-33-6
  2. ^ Days in each Month - Mnemonics to improve memory
  3. ^ The Boy Mechanic: A Handy Calendar (1913) from Project Gutenberg
  4. ^ http://www.bahai.us/bahai-calendar
  5. ^ Sri Lanka – Festival Calendar
  6. ^ The Significance of Poya
  7. ^ The Old English Calendar
  8. ^ The Calendar by Marsigli: the ancient Hungarian Calendar
  9. ^ Hónapok nevei

1911 encyclopedia

Up to date as of January 14, 2010

From LoveToKnow 1911

MONTH (a common Teutonic word, cf. Ger. Mond, Du. maand, Dan. maaned, &c., and cognate with Lat. mensis, Gr. µ7v, &c., in other branches of the Indo-Germanic family; all ultimately from the root seen in the word for the moon in nearly all those languages), originally the period between two returns of the new moon; generally called a lunar and sometimes a synodic or illuminative month. The anomalistic month is the mean time taken by the moon in passing from one perigee to the next; the sidereal month is the mean time in which the moon makes a circuit among the stars; the tropical month is the mean time in which the moon traverses 360° of longitude; the nodical or draconic month is the mean time taken by the moon in passing from one rising node to the next; the solar month is one-twelfth of a tropical year. The lengths of the various months are: synodic = 29.53059 days; anomalistic = 2 7.554 60, sidereal = 27 32166, tropical = 27.32156, nodical = 27.21222, solar= 30.43685. (For the calendar months see Calendar.) In law a month may mean either a lunar month, that is, a period of twenty-eight days, or a calendar month. At common law, "month" generally means a lunar month, although in mercantile matters it has been generally understood to mean a calendar month, but there is no general exception giving it that meaning in commercial documents. It can only have that meaning where according to the ordinary rules of construction a secondary meaning can be admitted (Bruner v. Moore, 1904, 1 Ch. 305). In bills of exchange or promissory notes month means a calendar month (Bills of Exchange Act, 1882, s. 14 [4]). Where a servant is engaged subject to a month's notice or payment of a month's wages month is interpreted as a calendar month (Gordon v. Potter, 1 F. & F. 644). In acts of parliament passed before the year 1850 month, unless otherwise specially interpreted, means lunar month, but in all acts passed since that date, month, unless words be added showing that lunar month was intended, means calendar month (Interpretation Act 1889, s. 3). In the rules of the supreme court and in the county court rules month means a calendar month. In mercantile contracts in computing the period of a month the day from which the time is to begin to run is excluded, but in sentences of imprisonment the day on which the sentence begins is included, so that the numerically corresponding day in the month in which the sentence expires would be excluded.


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Bible wiki

Up to date as of January 23, 2010

From BibleWiki

Among the Egyptians the month of thirty days each was in use long before the time of the Exodus, and formed the basis of their calculations. From the time of the institution of the Mosaic law the month among the Jews was lunar. The cycle of religious feasts depended on the moon. The commencement of a month was determined by the observation of the new moon. The number of months in the year was usually twelve (1 Kg 4:7; 1Chr 27:1ff); but every third year an additional month (we-Adar) was inserted, so as to make the months coincide with the seasons.

"The Hebrews and Phoenicians had no word for month save 'moon,' and only saved their calendar from becoming vague like that of the Moslems by the interpolation of an additional month. There is no evidence at all that they ever used a true solar year such as the Egyptians possessed. The latter had twelve months of thirty days and five epagomenac or odd days.",
-- Palestine Quarterly, January 1889.
This entry includes text from Easton's Bible Dictionary, 1897.

what mentions this? (please help by turning references to this page into wiki links)


Simple English

A month is an amount of time used with calendars. It is about one twelfth of a year. It is a little longer than a natural period of the moon 29.53 days. In some cultures, the idea for months came from moon phases. People have counted days based on moon phases for a very long time. Some calendars are still strongly based on the moon, or "lunar calendars".

Others, called "solar calendars", ignore the moon, and depend entirely on the Sun — for example, the Gregorian calendar of 365 or 366 days (twelve months) used in much of the world today.

Months of the Year

January | February | March | April | May | June | July | August | September | October | November | December

krc:Ай (заман)mrj:Тӹлзӹ (календарь)



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