Why are there leap years?
by 
Zack Be Gone - All Hail Firebrand.
ANSWERS: 5
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because the earth doesn't rotate the sun in 365 days, but in about 365.25 days.
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Because the year is actually 365 and 1/4 days. We just ingore it until they add up to a full day so as to not off set the seasons. Another explanation is there is an extra four minutes at the end of each day.
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And they are not exactly 365 1/4 days. That is why every 400 years we don't have a leap year when one is due.
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To remind us to take a leap. This year, I got the job interview that started my career on February 29th. The day will be very lucky to me from here on out :)
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The Earth takes 365 and 1/4th days to revolve around the sun. For matters of convenience we take the period to be 365 days but to keep it accurate we add an extra day every fourth year.
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