moon前面的定冠词用啥

前面的定冠词用the，例如：

1、We could see the moon through a break in the clouds.我们能从云缝里看到月亮。

2、The moon is in its first quarter.月亮正处于上弦。

3、The moon landing inaugurated a new era in space exploration.登陆月球开创了太空探索的新纪元。