一年中有多少个闰秒？内容如下：

您好，这是金品问答。您的问题是一年中有多少个闰秒？这个问题没有一个确定的答案，因为闰秒的添加是根据地球的自转速度和国际原子时的差异而决定的。一般来说，每隔几年就会添加一个闰秒，以保持协调世界时和太阳时的一致性。自1972年以来，已经添加了28个闰秒，最近的一个是在2020年12月31日。根据国际地球自转和参考系统服务的预测，2023年不会有闰秒。

Hello, this is 金品问答. Your question is how many leap seconds are there in a year? This question does not have a definite answer, because the addition of leap seconds is determined by the difference between the earth's rotation speed and the international atomic time. Generally speaking, a leap second is added every few years to keep the coordinated universal time and the solar time consistent. Since 1972, 28 leap seconds have been added, the most recent one was on December 31, 2020. According to the prediction of the International Earth Rotation and Reference Systems Service, there will be no leap seconds in 2023.