Flat earth is not real (Science)

Dear flat earthers,

As I understand you believe that our earth is flat and that is unfortunatley not true. I say this for a very simple reason. and that is the moon. Because the moon has a cycle which the moon goes through every month. In certain models that I saw this is completley impossible as the cycle depends on the reflection of light from the sun which for what ever reason is on the complete opposite side of the world meaning the moon only has two states depending on where you are standing. One is the full moon or nothing. So the flat earth is impossible.