sidereal month

例句：

1. 1. The sidereal month is the time when the Moon is at its fullest and brightest.
   恒星月是月亮最圆最亮的时期。
2. 2. During the sidereal month, the Earth's axis is tilted towards the Sun, causing the Northern Hemisphere to experience longer days.
   在恒星月期间，地球的轴向倾斜朝向太阳，导致北半球经历更长的白天。
3. 3. The sidereal month is also a time for observing celestial bodies, such as planetsand stars.
   恒星月也是观察天体，如行星和星星的好时机。