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• Shorter times
• 10 megaseconds = 115.74 days
• 128.6 days — half life of thulium-170
• 224.701 days — one orbit of Venus
• 271.79 days — half life of cobalt-57
• 280 days — average length of a human pregnancy; ~24 million seconds
• 330 days — half life of vanadium-49
• 333.5 days — half life of californium-248
• 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
• 365 days — a regular year in many solar calendars; ~31.53 million seconds
• 365.24219 days — a mean tropical year near the year 2000
• 365.2424 days — a vernal equinox yearA tropical year is the length of time that the Sun, as viewed from the Earth, takes to return to the same position along the ecliptic (its path among the stars on the celestial sphere). The precise length of time depends on which point of the ecliptic one.
• 365.2425 days — the average length of a year in the Gregorian calendarThe Gregorian calendar is the calendar currently used in the Western world. A modification of the Julian calendar, it was first proposed by Neapolitan doctor Aloysius Lilius, and promulgated by the eponymous Pope Gregory XIII on February 24, 1582 (Note: T
• 365.25 days — the average length of a year in the Julian calendarThe Julian calendar was introduced by Julius Caesar in 46 BC, taking force in 45 BC or 709 ab urbe condita''. It was chosen after consultation with the Alexandrian astronomer Sosigenes and was probably designed to approximate the tropical year, known sinc
• 365.2564 days — a sidereal yearThe sidereal year is the time for the Sun to return to the same position in respect to the stars of the celestial sphere. The sidereal year is the orbital period of Earth. A sidereal year equals 365. 2564 mean solar days. The sidereal year is 20 minutes a
• 366 days — a leap yearA leap year (or intercalary year is a year containing an extra day or month in order to keep the calendar year in sync with an astronomical or seasonal year. Seasons and astronomical events do not repeat at an exact number of days, so a calendar which had in many solar calendars; 31.62 million seconds
• 373.59 days — half-life of rutheniumRuthenium is a chemical element in the periodic table that has the symbol Ru and atomic number 44. A rare transition metal of the platinum group, ruthenium is found associated with platinum ores and used as a catalyst in some platinum alloys. Notable char-106
• 383, 384 or 385 days — the lengths of leap years in some lunisolar calendars
• 383.9 days — 13 lunar months; leap year in some lunisolar calendars
• 396.1 days — half-life of neptuniumuranium neptunium plutonium Pm Np Full table General Name, Symbol, NumberNeptunium, Np, 93 Chemical series Actinides Period, Block 7 , f Density, Hardness 20250 kg/m3, n/a Appearance Silvery metallic Atomic properties Atomic weight 1 E-25 kg|[237] u]] Ato-235
• 462.6 days — half-life of cadmiumCadmium is a chemical element in the periodic table that has the symbol Cd and atomic number 48. A relatively rare, soft, bluish-white, toxic transition metal, cadmium occurs with zinc ores and is used largely in batteries. Notable characteristics Cadmium-109
• 1.88 years — one orbit of Mars
• 1.92 years — half life of thulium-171
• 100 megaseconds = 3.2 years
• Longer times