365 Days are in 1 year and
366 Days are every 4 years in the fourth year.
Explanation : Teorically, there are 365,25 days in a year. The next year is same, but, if 365,25 is multiplied by two, the result is 365,50 and if multiplied it by four equals 366,00 days. It means, if the number of the year (Ex : 2012) can be divided by 4, it means that year is called leap year. If you wan't proof, divide this year by four = 2012 divided by 4 = 503 so this year is leap year. Another proof ? See February calendar. Usually, the month of February has 28 days. Every four years, in the fourth year (it's now too), February has 29 days. Don't search for February with 29 days. See this year's (2012) February calendar in the computer, internet, board calendar, or wall calendar. It has 29 days. It means one day added in February (29th day) and the total day is 366 every four years in the fourth year.
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