You know that one side of the moon always faces us. So you’d have to be on that side to see any Earth at all. But from any part of the moon’s near side, you could see Earth wax and wane – just as the moon does as seen from our world. Both the Earth and the moon are always half illuminated by the sun. But from either world, at any given time, you can see varying portions of that lighted half – or various phases of the Earth or moon.
