2020年是一个闰年,2月29日这个闰日即将登场。为什么会有闰年和闰日呢?其实,这是一个历史遗留问题。而且,闰日也不是“四年等一回”那么简单。 At some point in elementary school, your science teacher probably explained to you that there are 365 days in a year because that’s how long it takes for Earth to complete one full rotation around the sun. What they might not have specified, however, is that it’s not exactly 365 days—it’s actually closer to 365.2421 days. 上小学时,你们的科学老师很可能会向你们解释一年有365天,因为这是地球绕太阳公转一圈的时间。不过,他们可能没有详细说明,地球公转一圈并不是精确的365天,实际上说是365.2421天更准确一些。 |