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A common year is 365 days = 8760 hours = 525600 minutes = 31536000 seconds.

A leap year is 366 days = 8784 hours = 527040 minutes = 31622400 seconds.

The Julian year, as used in astronomy and other sciences, is a time unit defined as exactly 365.25 days. This is the normal meaning of the unit "year" (symbol "a" from the Latin annus) used in various scientific contexts. In the Unified Code for Units of Measure, the symbol a (without subscript) always refers to the Julian year aj of exactly 31557600 seconds.

There are also several other definitions of a year, which differ slightly.

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