What is the Moon ?
We see the moon at night. But it is hidden by the sun during day. The moon is a planet that revolves around our earth. That’s why we see her fat.
The moon is so close that it creates the tides, with also the sun a little. So, when we don’t see the moon, there may be a low tide.
All this is due to gravity. Bodies attract each other. Your body is attracted to earth right under you. In space where gravity is poor, water clumps on bodies.
The moon’s crescent is due to the sun’s reverberation on the moon. But the whole moon is still there.
Compare the tides to the moon’s views.