Megasecond

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 (10⁶ seconds and 10⁹ 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 ($\pi \cdot 10^7 s$) — The value of pi times 10⁷ seconds is sometimes given as an approximate year value; it works out to 363.61026 days.
• 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
• 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).

• Longer Times

See also

• Months
• Years
• Decades