我们知道闰年、闰月,可你听说过闰秒吗?2015年就迎来了史上第26次闰秒,时间在6月30日午夜,原子钟在23点59分59秒后停留一秒钟,让变慢的地球自转跟上原子钟步伐——也就是说,今年,大家额外“多出”了一秒钟时间,这一秒就叫闰秒。为什么要停留一秒?因为世界上有两种时间计量系统:基于地球自转得出的“世界时”和基于原子振荡周期确定的“原子时”。由于两种时间尺度对秒的测量方法不同,随着时间的推移,这两个时间系统之间就会 We know that leap year, leap month, but you have heard of leap seconds? In 2015 ushered in the history of the 26th leap second, the time at midnight on June 30, the atomic clock at 23:59:59 after a second stay, Let slow Earth Rotation keep pace with the atomic clock - that is, this year, everyone extra “extra” for a second, this second is called leap second. Why stop for a second? Because there are two types of time measurement systems in the world: “world time ” based on the Earth’s rotation and “atomic ” based on the period of the atomic oscillation. As the two time scales measure the seconds differently, as time goes by, there will be time between the two time systems