A leap year is any year "whose number is perfectly divisible by four - except for years which are both divisible by 100 and not divisible by 400." Got that? By the time you are finished with this site, you will understand the whys and whens of Leap Year Day. Then, if you're game, you might want to click on links to any of the 40 other astronomy-related topics available on page-left.
Western Washington University Planetarium
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• High School Middle School