How is a leap year formed?
The Earth takes 365 days, 5 hours, 48 minutes and 56 seconds to complete one revolution around the Sun. For our convenience, we count only 365 days in a year. The remaining 6 hours are computed to one extra day after every four years. This additional day is added to the month of February in that year. Thus, February has 29 days and that year has 366 days. Such a year is called a leap year and the extra day in the month of February is called a leap day. This is how a leap year is formed.
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