恒星日
hénɡ xīnɡ rì
- 名sidereal day
恒星日-
一个恒星日比一个太阳日大约短4分钟。
A sidereal day is about 4 minutes shorter than a solar day .
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恒星日比平均太阳日短三分五十六秒。
A sidereal day is shorter than a mean solar day by 3 minutes and 56 seconds .
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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。
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 .