A leap second is added to keep uniform timekeeping within 0.9 second of the Earth's rotational time, which can speed up or slow down because of many factors, including ocean tides.
A leap second is added to keep uniform timekeeping within 0.9 second of the Earth's rotational time, which can speed up or slow down because of many factors, including ocean tides.
增加这一闰秒是为了保证协调世界时（原子时）和地球自转时间（天文时）之间的差距控制在0.9秒以内，地球自转速度的加快或减慢受到很多因素的影响，潮汐就是其中之一。