Although it is possible to have a negative leap second -- that is, a second deducted from Coordinated Universal Time -- so far all have been add-ons, reflecting the Earth's general slowing trend due to tidal braking.
Although it is possible to have a negative leap second -- that is, a second deducted from Coordinated Universal Time -- so far all have been add-ons, reflecting the Earth's general slowing trend due to tidal braking.
尽管也有实施负闰秒制（从协调世界时中扣除一秒）的可能，但迄今为止，只有加，没有减，这说明由于受潮汐减速的影响，地球的自转速度大体上呈减慢趋势。