Megasecond
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For historical events in the megasecond range, see timeline of modern history. For a list halflives in this timescale, see List of isotopes by halflife.
A megasecond (symbol: Ms) 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 (10^{6} seconds and 10^{9} seconds), or 11.6 days and 31.7 years.
<1 year
 1.2096 Ms (14 days) – a fortnight
 2.3605915 Ms (27.3217 days) – sidereal month
 2.4192 Ms (28 days) – length of February in nonleap years
 2.5056 Ms (29 days)– length of February in a leap year
 2.55144 Ms (29.53059 days) – mean synodic month
 2.592 Ms (30 days) – length of the months April, June, September, and November
 2.629746 Ms (30.436875 days) – mean length of a Gregorian calendar month
 2.6784 Ms (31 days) – length of the months January, March, May, July, August, October, and December
 7.6 Ms (87 days 23.3 hours) – one orbit of Mercury
 7.776 Ms (90 days) – approximate length of a quarter year, a common corporate and financial reporting interval
 8.208 Ms (95 days)  length of Napoleon's attempt at regaining power, known as the Hundred Days
 8.64 Ms (100 days)  approximate length of the Rwandan genocide
 19.4141 Ms (224.701 days) — one orbit of Venus
 22.464 Ms (260 days) — length of the Tzolk'in, or Sacred Round, in the Mayan calendar
 24.192 Ms (280 days) — average length of a human pregnancy
 26.2656 Ms (304 days) — length of the year in the calendar of Romulus
 30.4992, 30.672 or 30.586 Ms (353, 354 or 355 days) — the lengths of regular years in some lunisolar calendars
 30.6173136 Ms (354.37 days) — 12 lunar months; the average length of a year in lunar calendars
 31.104 Ms (360 days) — one tun in the Mesoamerican Long Count calendar
 31.4159265... Ms () — The value of pi times 10^{7} seconds is sometimes given as an approximate year value; it works out to 363.61026 days.
 31.536 Ms (365 days) — a regular year in many solar calendars. Also the fixed length of the year in the Ancient Egyptian calendar and the length of a Haab in the Mayan calendar.
 31.556925 Ms (365.24219 days) — a mean tropical year near the year 2000
 31.556943 Ms (365.2424 days) — a vernal equinox year.
 31.556952 Ms(365.2425 days) — the average length of a year in the Gregorian calendar
 31.5576 Ms (365.25 days) — a Julian year, the average length of a year in the Julian calendar
 31.558153 Ms (365.2564 days) — a sidereal year
>1 year
Some times beyond this point are too approximate to give values in seconds
 31.6224 Ms (366 days) — a leap year in many solar calendars; 31.62 million seconds
 31.622777 Ms (10^{7.5} s) — the square root of 10, times 10 million seconds = 31,622,776.6 seconds = 1.00208673 years = 366.004359 days = a leap year plus 6.27 minutes
 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
 729 days — in Canada, the maximum prison sentence that can be served in a provincial correctional facility as opposed to a federal institution under the jurisdiction of the Correctional Service of Canada, otherwise known as "two years less a day"
 4 years—full term of the President of the United States; (roughly) an Olympiad.
 4 years, 42 days—duration of World War I
 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 and Canadian Parliaments
 6 years—full term of a senator in Australia and the United States. Duration of World War II
 7 years—the interval between leap seconds on December 31, 1998 and December 31, 2005, the longest one as of 2012^{[update]}
 10 years—one decade = 3.16 × 10^{8} 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 K12 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 yearsage at which (in Australia and 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 consume alcoholic beverages in the United States.
 29 years—recorded maximum lifespan of a dog
 29.458 years—one orbit of Saturn
 30.437 years—duration of the World Trade Center
See also

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