我们每天看到月亮从东边升起,西边落下,类似于日出和日落。地球自东向西自转运行,人类在地球上可以看到月球升起落下。月球每次月相变化周期为29.5天。月球每天升起的时间平均晚50分钟。这可以解释月亮为什么有时升空是在夜晚,多数情况又是在白天升起。月球环绕地球运行的轨道并不是一个圆形,而是一个椭圆形,因此月球每次环绕一周时,地球中心与月球中心的 Every day we see the moon rising from the east, falling to the west, similar to sunrise and sunset. As the Earth rotates from east to west, humans can see the moon rising and falling on Earth. The monthly moon phase change period is 29.5 days. The moon rises 50 minutes late on average every day. This may explain why the moon is sometimes ejected at night, and in most cases it rises during the day. The lunar orbit around the Earth is not a circle, but an oval, so every time the lunar one week, the Earth’s center and the moon’s center