According to the Honor Society of Leap Year Day Babies, which claims more than 10,000 members worldwide, the Earth takes 365.24 days, or more precisely 365 days, 5 hours, 48 minutes and 45 seconds, to make a complete cycle around the sun.
Therefore, every four years the world would be a full day out of synch with the calendar. The society says a person who lived to 90 would see his or her birthday drift by three weeks over the course of a lifetime. So, one extra day added to the end of February every four years prevents this from happening.
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