Since it never happened that one second was deducted in a year,
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送交者: Amsel 于 2010-03-26, 16:27:28:
回答: leap second is exactly about 某一年要扣掉一秒 and 某一年要加一秒 由 steven 于 2010-03-26, 16:17:39:
the most significant reason is still the length definition of a second. Similar to what Hunhun said, the reason for a leap second is that the length of a year is not an integer multiple of a second (defined by an atomic clock).
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