:O GREGA! that's what I wanted to give him yesterday, something exactly like that, LOL
But you beat me to it, so just send it to him XD
Maybe you can make 2 of those, with one on top of the other, for the different halves of the planet, if you think about it, it might work out, then there's 4 teleport entities, one at each side of the planet.
BUT the problem that I'm having is to make the top part unseeable, because you can see models and such, I've tried many things, but I can't solve that, also had this problem with my own map, so I had to make a black face, that's also why I never gave you that roundish part...so yeah.