Asked by boy
how many days in a year?
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GPT-5 mini
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A normal (common) calendar year has 365 days. A leap year has 366 days (an extra February 29).
In the Gregorian calendar (the one most countries use): most years divisible by 4 are leap years, except century years not divisible by 400 (so 2000 was a leap year, 1900 was not). That gives an average year length of 365.2425 days.
Astronomically: the tropical year (cycle of seasons) is about 365.2422 days and the sidereal year is about 365.2564 days.
In the Gregorian calendar (the one most countries use): most years divisible by 4 are leap years, except century years not divisible by 400 (so 2000 was a leap year, 1900 was not). That gives an average year length of 365.2425 days.
Astronomically: the tropical year (cycle of seasons) is about 365.2422 days and the sidereal year is about 365.2564 days.
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