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From Wikipedia, the free encyclopedia

A megasecond is 1 million seconds, or roughly 11.6 days. There are roughly 31.5 megaseconds in a year. This page lists times between 1 and 1000 megaseconds (106 seconds and 109 seconds), or 11.6 days and 31.7 years.

  • shorter times
  • 14 days – a fortnight
  • 27.3217 days – sidereal month
  • 28 days – length of February in non-leap years
  • 29 days – length of February in a leap year
  • 29.53059 days – mean synodic month
  • 30 days – length of the months April, June, September, and November
  • 30.436875 days – mean length of a Gregorian calendar month
  • 31 days – length of the months January, March, May, July, August, October, and December
  • 87 days 23.3 hours – one orbit of Mercury
  • 90 days – approximate length of a quarter year, a common corporate and financial reporting interval
  • 95 days - length of Napoleon's attempt at regaining power, known as the Hundred Days
  • 100 days - approximate length of the Rwandan genocide
  • 224.701 days — one orbit of Venus
  • 260 days — length of the Tzolk'in, or Sacred Round, in the Mayan calendar
  • 280 days — average length of a human pregnancy; ~24 million seconds
  • 353, 354 or 355 days — the lengths of regular years in some lunisolar calendars
  • 354.37 days — 12 lunar months; the average length of a year in lunar calendars
  • \pi \cdot 10^7 s — The value of pi times 107 seconds is sometimes given as an approximate year value; it works out to 363.61026 days.
  • 360 days — one tun in the Mesoamerican Long Count calendar
  • 365 days — a regular year in many solar calendars; ~31.53 million seconds. Also the fixed length of the year in the Ancient Egyptian calendar and the length of a Haab in the Mayan calendar.
  • 365.24219 days — a mean tropical year near the year 2000
  • 365.2424 days — a vernal equinox year.
  • 365.2425 days — the average length of a year in the Gregorian calendar
  • 365.25 days — the average length of a year in the Julian calendar
  • 365.2564 days — a sidereal year
  • 366 days — a leap year in many solar calendars; 31.62 million seconds
  • 383.9 days — 13 lunar months; leap year in some lunisolar calendars
  • 383, 384 or 385 days — the lengths of leap years in some lunisolar calendars
  • 686.971 days — one orbit of Mars
  • 4 years—full term of the President of the United States; (roughly) an Olympiad.
  • 4.37 years—the length of time for light from Alpha Centauri to reach Earth
  • 4.6 years—orbital period of Ceres
  • 5 years—maximum length of a term in the British Parliament
  • 6 years—full term of a Senator in the United States
  • 7 years—the interval between leap seconds on December 31, 1998 and December 31, 2005, the longest one as of 2009
  • 10 years—one decade = 3.16 × 108 seconds
  • 11 years -- sunspot activity cycle (7.5 to 11 years)
  • 11.87 years—one orbit of Jupiter
  • 12 years—length of one cycle through the Chinese zodiac (Terrestrial branch)
  • 12.27 years—duration of Nazi Germany
  • 13 years—typical time to complete K-12 education in the United States.
  • 15 years—age at which one is first eligible to receive a driver's license in New Zealand.
  • 16 years—usual age at which one is first eligible to receive a driver's license in most States of the United States.
  • 18 years-age at which (in the United States) one is legally permitted to vote, sign contracts, and to use tobacco products.
  • 18.03 years -- Saros cycle, the period of solar eclipses and lunar eclipses
  • 19.0002 years—235 months (1 Metonic cycle)
  • 19.713 years (7200 days) -- one katun in the Mesoamerican Long Count calendar
  • 21 years—age at which one can consumer alcoholic beverages in the United States.
  • 29 years—recorded maximum lifespan of a dog
  • 29.458 years—one orbit of Saturn

Half lives


To help compare orders of magnitude of different times this page lists times between 106 seconds and 107 seconds (approximately 11.6 days and 116 days). A megasecond is one million seconds. See also times of other orders of magnitude.

  • shorter times
  • 1.21×106 seconds = 14 days – a fortnight
  • 2.36×106 seconds = 27.3217 days – sidereal month
  • 2.42×106 seconds = 28 days – length of February in non-leap years
  • 2.51×106 seconds = 29 days – length of February in a leap year
  • 2.55×106 seconds = 29.53059 days – mean synodic month
  • 2.59×106 seconds = 30 days – length of the months April, June, September, and November
  • 2.629746×106 seconds = 30.436875 days – mean length of a Gregorian calendar month
  • 2.68×106 seconds = 31 days – length of the months January, March, May, July, August, October, and December
  • 7.60×106 seconds = 87 days 23.3 hours – one orbit of Mercury
  • 7.78×106 seconds = 90 days – approximate length of a quarter year, a common corporate and financial reporting interval

Half lives

  • 1.38×106 seconds = 15.9735 days – half life of vanadium-48
  • 1.54×106 seconds = 17.81 days – half life of californium-253
  • 2.39×106 seconds = 27.7025 days – half life of chromium-51
  • 4.45×106 seconds = 51.5 days – half life of mendelevium-258
  • 5.23×106 seconds = 60.5 days – half life of californium-254
  • 6.68×106 seconds = 77.27 days – half life of cobalt-56
  • 7.24×106 seconds = 83.79 days – half life of scandium-46
  • 7.54×106 seconds = 87.32 days – half life of sulfur-35
  • 8.04×106 seconds = 93.1 days – half life of thulium-168
  • 8.68×106 seconds = 100.5 days – half life of fermium-257


Simple English

This page lists times between 106 seconds and 107 seconds (approximately 11.6 days and 116 days). A megasecond is one million seconds.

  • shorter times
  • 1.21×106 seconds = 14 days – a fortnight
  • 1.38×106 seconds = 15.9735 days – half life of vanadium-48
  • 1.54×106 seconds = 17.81 days – half life of californium-253
  • 2.36×106 seconds = 27.3217 days – sidereal month
  • 2.39×106 seconds = 27.7025 days – half life of chromium-51
  • 2.42×106 seconds = 28 days – length of February in non-leap years
  • 2.51×106 seconds = 29 days – length of February in a leap year
  • 2.59×106 seconds = 30 days – length of the months April, June, September, and November
  • 2.68×106 seconds = 31 days – length of the months January, March, May, July, August, October, and December
  • 4.45×106 seconds = 51.5 days – half life of mendelevium-258
  • 5.23×106 seconds = 60.5 days – half life of californium-254
  • 6.68×106 seconds = 77.27 days – half life of cobalt-56
  • 7.24×106 seconds = 83.79 days – half life of scandium-46
  • 7.54×106 seconds = 87.32 days – half life of sulfur-35
  • 7.60×106 seconds = 87 days 23.3 hours – one orbit of Mercury around the Sun
  • 8.04×106 seconds = 93.1 days – half life of thulium-168
  • 8.68×106 seconds = 100.5 days – half life of fermium-257
  • longer times







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