What Is a Leap Year?

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9. Lunar Calendar

In the West, and in many other parts of the world, a solar calendar is used. That is to say, the calendar is based on Earths relative position to the sun. In other parts of the world, particularly Islamic countries in the Middle East, a lunar calendar is used instead.

Lunar calendars have similar problems to solar calendars, and the solution to those problems is pretty much the same: a leap year in which extra days are added. The Islamic calendar has 354 days, and a leap day is added every 3 years.

Leap Year

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