Tropical year, and sidereal year are two different concepts.
回归年与恒星年是不同的两个概念.
The sidereal year is not used to construct a calendar.
恒星年不用于编制年历.
A sidereal day is about 4 minutes shorter than a solar day.
一个恒星日比一个太阳日大约短4分钟。
A sidereal day is shorter than a mean solar day by 3 minutes and 56 seconds.
恒星日比平均太阳日短三分五十六秒。
The sidereal diurnal variation of cosmic ray ties up with the most basic and important problem in cosmic ray physics such as the origin, propagation and the acceleration mechanisms of cosmic ray.
宇宙线的恒星日变化紧密联系于宇宙线的起源、其传播途径的性质,以及宇宙线的加速机制等宇宙线物理中最基本的重大问题。
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