How Many Days Are In One Year?

Gregorian calendar year

1 calendar common year = 365 days

1 calendar leap year = 366 days

Julian year

1 julian year = 365.25 days, or
365 days, 6 hours

Sidereal year

1 sidereal year = 365.25636 days, or
365 days, 6 hours, 9 minutes, and 9.5 seconds

Tropical year

1 tropiical year = 365.242189 days, or
365 days, 5 hours, 48 minutes and 45.5 seconds

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