A Quick History Lesson
The Egyptians were the first to come up with the idea of adding a leap day once every four years to keep the calendar in sync with the solar year. Later, the Romans adopted this solution for their calendar, and they became the first to designate February 29 as the leap day.
Read more: Leap Year 101 – Next, When, List, Days, Calendar, Years, Calculation, Last, Rules — Infoplease.com http://www.infoplease.com/spot/leapyear2.html#ixzz181RF1wRr
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