# Megasecond

From Infogalactic: the planetary knowledge core

For historical events in the megasecond range, see timeline of modern history. For a list half-lives in this timescale, see List of isotopes by half-life.

A **megasecond** (symbol: **Ms**) is 1 million seconds, or roughly 11.6 days. There are roughly 31.6 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 31.6 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 non-leap 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**6.652 Ms**(77 days) - length between the introduction and discontinuation of New Coke**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**33.17 Ms**(383.9 days) — 13 lunar months; leap year in some lunisolar calendars**33.09, 33.18 or 33.26 Ms**(383, 384 or 385 days) — the lengths of leap years in some lunisolar calendars**59.3543 Ms**(686.971 days) — one orbit of Mars**63 Ms**(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"**126.75 Ms**(4 years) — full term of the President of the United States; (roughly) an Olympiad.**130.4 Ms**(4 years, 42 days) — duration of World War I**138.35 Ms**(4.37 years) — the length of time for light from Alpha Centauri to reach Earth**145.8 Ms**(4.6 years) — orbital period of Ceres**158.44 Ms**(5 years) — maximum length of a term in the British and Canadian Parliaments**190.12 Ms**(6 years) — full term of a senator in Australia and the United States. Duration of World War II**221.82 Ms**(7 years) — the interval between leap seconds on December 31, 1998, and December 31, 2005, the longest one as of 2012^{[update]}**316.88 Ms**(10 years) — one decade**350 Ms**(11 years) — sunspot activity cycle (7.5 to 11 years)**376.14 Ms**(11.87 years) — one orbit of Jupiter**380.257 Ms**(12 years) — length of one cycle through the Chinese zodiac (Terrestrial branch)**388.8 Ms**(12.27 years) — duration of Nazi Germany**411.9 Ms**(13 years) — typical time to complete K-12 education in the United States.**475.32 Ms**(15 years) — age at which one is first eligible to receive a driver's license in New Zealand.**507.01 Ms**(16 years) — usual age at which one is first eligible to receive a driver's license in most states of the United States.**570.4 Ms**(18 years) - age at which (in Australia and the United States) one is legally permitted to vote, sign contracts, and to use tobacco products.**571.34 Ms**(18.03 years) — Saros cycle, the period of solar eclipses and lunar eclipses**602.08 Ms**(19.0002 years) — 235 months (1 Metonic cycle)**624.667 Ms**(19.713 years (7200 days)) — one katun in the Mesoamerican Long Count calendar**665.45 Ms**(21 years) — age at which one can consume alcoholic beverages in the United States.**920 Ms**(29 years) — recorded maximum lifespan of a dog**933.468 Ms**(29.458 years) — one orbit of Saturn**957.963 Ms**(30.231 years (11,042 days)) — duration of the World Trade Center (time from the completion of the second tower to the towers' destruction on September 11, 2001).