凯撒与闰年
请参阅说明。单击图片将下载可用的最高分辨率版本。
日历
天文·每日一图
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