lunar phase

例句：

1. 1. The lunar phases are crucial for predicting the weather.
   月相对于预测天气至关重要。
2. 2.During the new moon, the moon is at its lowest point in the sky.
   在新月期间，月亮在天空中处于最低点。
3. 3.Astronomy enthusiasts often study the lunar phases to understand the earth's orbit around the sun.
   天文爱好者经常研究月相，以了解地球围绕太阳的轨道。