Year

A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, a "Martian year" is a year on Mars.

Summary of various kinds of year

• 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 common 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 year.
• 365.2425 days — the average length of a year in the Gregorian calendar
• 365.25 days — the average length of a year in the Julian calendar; the light year is based on it; it is 31,557,600 seconds
• 365.2564 days — a sidereal year
• 366 days — a leap year in many solar calendars; 31.62 million seconds
• 383, 384 or 385 days — the lengths of leap years in some lunisolar calendars
• 383.9 days — 13 lunar months; a leap year in some lunisolar calendars

An average Gregorian year is 365.2425 days = 52.1775 weeks, 8,765.82 hours = 525,949.2 minutes = 31,556,952 seconds (mean solar, not SI).

Related Topics:
Day - Week - Hour - Minute - Second

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A common year is 365 days = 8,760 hours = 525,600 minutes = 31,536,000 seconds.

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A leap year is 366 days = 8,784 hours = 527,040 minutes = 31,622,400 seconds.

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The 400-year cycle of the Gregorian calendar has 146097 days and hence exactly 20871 weeks.

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See also Numerical facts about the Gregorian calendar.

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