Megasecond facts for kids

A megasecond is one million seconds. This page lists times between 10⁶ seconds and 10⁹ seconds, which is about 11.6 days and 31.7 years.

Ten megaseconds is equal to 115.74 days. 100 megaseconds is equal to 3.2 years.

Less than a year

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
128.6 days - half life of thulium-170
138 days - half life of polonium- 210
224.701 days - one orbit of Venus around the sun
271.79 days - half life of cobalt-57
280 days - normal length of a human pregnancy; about 24 million seconds
330 days - half life of vanadium-49
333.5 days - half life of californium-248
$\pi \cdot 10^7 s$ - The value of pi times 10⁷ seconds is sometimes given as an approximate year value; it works out to 363.61026 days.

More than a year

365 days - a regular year in many solar calendars; about 31.53 million seconds
365.2425 days - the normal length of a year in the Gregorian calendar
365.25 days - the normal length of a year in the Julian calendar
366 days - a leap year in many solar calendars; 31.62 million seconds
373.59 days - half-life of ruthenium-106
396.1 days - half-life of neptunium-235
462.6 days - half-life of cadmium-109
1.88 years - one orbit of Mars
1.92 years - half life of thulium-171
3.3 years -- half life of rhodium-101
4 years—full term of the President of the United States
4.37 years—the amount of time it takes for light from Alpha Centauri to reach Earth
5.2714 years—half life of cobalt-60
6 years—full term of a Senator in the United States
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 around the sun
12.27 years—the amount of time Nazi Germany existed
13 years—the normal time is takes to complete K-12 education in the United States.
13.08 years—half life of californium-250
16.13 years—half life of niobium meta state Nb-93m
18.03 years -- Saros cycle, the period of solar eclipses and lunar eclipses
29 years—the longest a dog has ever been known to live
29.1 years—half life of curium-243
29.458 years—one orbit of Saturn around the sun
35 years (1.10 × 10⁹ s) – The youngest a person can be and become the President of the United States
36 years (1.14 × 10⁹ s) – the longest a cat has ever been known to live
63 years (1.99 × 10⁹ s) – half-life of titanium-44
65 years (2.05 × 10⁹ s) – a normal age for retirement
68.9 years (2.17 × 10⁹ s) – half-life of uranium-232
74 years (2.34 × 10⁹ s) – the amount of time communists controlled the Soviet Union
75 years (2.37 × 10⁹ s) – average life span of humans in the First World
84.3 years (2.66 × 10⁹ s) – one orbit of Uranus around the sun
100 years (3.16 × 10⁹ s) – one century
100.1 years (3.16 × 10⁹ s) – half-life of nickel-63
165 years (5.21 × 10⁹ s) – one orbit of Neptune
190 years (6 × 10⁹ s) – age of the oldest known tortoise
247.7 years (7.82 × 10⁹ s) – one orbit of Pluto around the sun
269 years (8.49 × 10⁹ s) – half-life of argon-39
310 years (9.8 × 10⁹ s) – one orbit of Makemake around the sun