If we measure the amount of time between two equinoxes, it ends up being 21 minutes shorter than a sidereal year.

如果我们测量两个春分点之间的时间量，最终会比恒星年短 21 分钟。

That means if we based our calendar on sidereal years, the seasons would quickly get out of sync, Christmas would end up in July, dogs and cats, living together, mass hysteria!

这意味着如果我们的日历基于恒星年，季节很快就会不同步，圣诞节将在七月结束， 狗和猫一起生活，集体歇斯底里！

The amount of time it takes a star or constellation to reach the same point in the sky at the same time of day is 365 days 6 hours 9 minutes 9.76 seconds, or a sidereal year.

一颗恒星或星座在一天的同一时间到达天空中的同一点所需的时间是 365 天 6 小时 9 分 9.76 秒，或恒星年。