The sidereal year is not used to construct a calendar.

恒星年不用于编制年历。正在加载用户记忆法…

Tropical year, and sidereal year are two different concepts.

回归年与恒星年是不同的两个概念.

A solar day is four minutes longers than a sidereal day.

一个太阳日比一个恒星日长4分钟.

Tropical year , and sidereal year are two different concepts .

在即回归年与恒星年是不同的两个概念。