为什么会有四年一次的闰日？_BEC初级作文

为什么会有四年一次的闰日？

But rounding 0.2421 up to 0.25 each year created an issue, because it didn’t quite add up to a full day every four years—and that tiny discrepancy meant that after 128 years, the calendar year ended up starting a day before Earth had completed its rotation around the sun. By the 14th century, the calendar year was starting a whopping 10 days before Earth finished its orbit.

但是把每年的0.2421天约等于0.25天也产生了一个问题，因为按照0.2421算的话，每四年要增加的并不是一整天。这个微小的差额意味着128年后，年历就会在地球完成公转前一天开始。到了14世纪，年历开始的时间比地球完成公转的时间早了10天之多。

In 1582, Pope Gregory XIII sought to correct the error by suggesting that we simply skip a leap day every so often. His Gregorian calendar, which we still use today, mandates that we omit the leap day during years evenly divisible by 100 but not by 400. For instance, the year 2000 included a leap day because it’s divisible by 100 and 400; the year 2100, on the other hand, will not include a leap day, since it’s evenly divisible by 100, but not by 400.

1582年，教皇格列高利十三世想要改正这一错误，于是建议我们时不时跳过一个闰日。他的格里历（我们今天仍在使用的公历）规定，在能够被100整除但不能被400整除的年份跳过闰日。举例来说，2000年有一个闰日，因为2000能被100和400整除；而2100年没有闰日，因为它能被100整除，但不能被400整除。

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