This looks really nice (apart from the shape of the gibbous moon, but others have already pointed that out).

Could you possibly detect the user's approximate location and rotate the whole thing 180 degrees if they're in the southern hemisphere? Down here, the moon looks technically the same, but it's 180 degrees* rotated because we're standing upside-down when we look at it. The craters are flipped and the light comes from the opposite side.

*Actually it's only rotated a full 180 degrees at opposite poles, and the exact rotation depends on your latitude. But perfect is the enemy of good etc.

Down here, the moon looks technically the same, but it's 180 degrees rotated because we're standing upside-down when we look at it.

We are standing the right way up your northernist simp.

They are the ones who are wrong. Never forget it.