It is because a year is actually 365 1/4 days long, therefore if we had every year as only 365 days the year would gradually move and we would eventually have summer during the winter and vice versa. Thus putting an extra day into a year every four years keeps everything in balance.
Answer:
A year is really 365.2422 gays long so we have to adjust the calendar to keep it accurate (those quarter days and a bit add up) and in accord with the solstices and equinnoxes. Every one thinks it's simple, in the Georgian calendar we add an extra day every 4 years - not quite right. The real rule is:
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Basically because it takes 1 year and 1/4 of a day for the Earth to make one orbit of the Sun. Thus we need to add 1 day to our year every 4 years to keep the calender correct.
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Oh, what a happy little question! In fact, there are typically 365 days in a year, but every four years we add an extra day in February, making it 366 days. This special year is called a leap year, and it helps keep our calendars in harmony with the Earth's orbit around the sun.
A bissextile year, more commonly known as a leap year, is a year that contains an extra day, February 29th. Leap years occur every four years to help align the calendar year with the solar year, which is about 365.25 days long. This extra day is added to compensate for the slight discrepancy between the two.
Since there are 365 days in a regular year and 1 extra day every four years (1,000,000*365)+(1,000,000/4) = 365,250,000 days
A century is 100 years. That is usually 75 normal years plus 25 leap years, totalling 36525 days, but the calendar used in the western world and elsewhere subtracts three days in every cycle of four centuries.
The typical number of days in a year is 365. However, every four years, a leap year occurs which has 366 days. This extra day is added to keep the calendar year synchronized with Earth's orbit around the sun.