标签: 闰年

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凯撒大帝与闰年

2020 February 29 Julius Caesar and Leap Days Image Credit & License: Classical Numismatic Group, Inc., Wikimedia Explanation: In 46 BC Julius Caesar reformed the calendar system. Based on advice by astronomer Sosigenes of Alexandria, the Julian calendar included one leap day every four years to account for the fact that an Earth year is slightly more tha...