Consider this question, is minecraft earth round or square? If you said round you are 100% wrong. The world does have an edge, like a cube, as known as the Far Lands. These lands never wrap around to each other like a spherical shape might be like. In fact the world abruptly ends at 30,000,000 meters according to this source: http://www.minecraftwiki.net/wiki/Far_Lands.

These facts conclude that the earth is square. Thus the laws of physics must be slightly askew in the minecraft realm. It seems as if gravity favors cubes over spheres.

So tell me, if the stars, earth, and every piece of terrain are square, what should make the sun and moon any different provided that they all act under the same laws of physics?