闰年的计算 [英] leap year calculation

问题描述

为了找到闰年，为什么一定要在今年由400 100不可分割的，可分？ 我明白为什么它必须要能被4整除请解释的算法。

In order to find leap years, why must the year be indivisible by 100 and divisible by 400? I understand why it must be divisible by 4. Please explain the algorithm.

推荐答案

一年的长度是（或多或少）365.242196天。 所以我们要减，或多或少，一季度天，使其适应：

The length of a year is (more or less) 365.242196 days. So we have to subtract, more or less, a quarter of a day to make it fit :

365.242196 - 0.25 = 364.992196 （加入4年51天）：但哎呀，现在是太小了！让我们来添加一天的hundreth（通过不补充说，每天一次在百年的： - ））

365.242196 - 0.25 = 364.992196 (by adding 1 day in 4 years) : but oops, now it's too small!! lets add a hundreth of a day (by not adding that day once in a hundred year :-))

364.992196 + 0,01 = 365.002196 （哎呀，有点太大了，让我们添加的那一天反正有一次在约400年）

364.992196 + 0,01 = 365.002196 (oops, a bit too big, let's add that day anyway one time in about 400 years)

365.002196 - 1/400 = 364.999696

365.002196 - 1/400 = 364.999696

快到了，现在，只需用leapseconds起到现在，然后，和你设置。

Almost there now, just play with leapseconds now and then, and you're set.

（注意：不改正的这一步后应用的原因，是因为一年也改变长！，这就是为什么leapseconds是最灵活的解决方案，请参阅examlple的here ）

(Note : the reason no more corrections are applied after this step is because a year also CHANGES IN LENGTH!!, that's why leapseconds are the most flexible solution, see for examlple here)

这就是为什么我想

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