Originally Posted by mib
This is a fine explanation but misses one key point -- that the tilt of the rotation axis to the plane of the Earth orbit does not change as Earth goes around the sun. In any case, while not too complicated, I doubt most people would be able to produce this explanation right away.
So you were just trolling.
And if I'm reading your post correctly we're saying the exact same thing. The north or south pole is always pointing at the same point in space, causing the change in where on earth is receiving the direct sunlight during its orbit.