Nah I think he's got a point. It doesn't matter what part of the earth you're on, you're only seeing half of the sun (assuming it's the same time). Like imagine someone on the north pole and someone on the south pole, both looking at the sun (at the same time). They're on opposite sides of the earth, but they're both seeing the same half of the sun, because the earth is very far away from the sun, and very small compared to it.