How to Judging a point is on the front side of the Earth, not is the back side?

How to Judging a point is on the front side of the Earth, not is the back side?
Help, Thanks!

Hi @ranxie,

I’m not sure what you mean by the “front side” or the “back side” of the Earth. Can you provide an image that explains what you mean?

America is on the front side of the earth, Asia is on the back side of the earth。
How to Judging a point is on the front side of the Earth, not is the back side?