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Originally Posted by bogsnarth
oh, my mistake.. i was doing it in a hurry.. averaging out the leap years should be more like 365x3 + 366 divided by 4.. so you're right it would be 365.25.. i just added 365+366 and divded by 2.
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A year is 365.242375 days.
In actuality the extra day every four years adds a bit too much, so in any year divisible by 100, they don't do the extra day, unless the year is divisible by 400 - which recoups the 3 extra days that occur over 400 years. A year is 365.2422 days. So in 1700, 1800 and 1900 there was no leap day, but recently in 2000 there was. Multiply 365.25 by 400 and subtract from it 365.2422 times 400 and you get 3 extra days.