Our calendar does not measure the earth's rotation around the sun with perfect accuracy. Leap years account for slight differences by adding a 366th day to our year. This is what leap years look like across eight different cultures.
How Leap Year is calculated on calendars around the world
Wednesday, February 29, 2012 | 6:00 a.m. CST;
updated 9:01 a.m. CST, Wednesday, February 29, 2012
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