Well now:
The radius of the sun's orbit around the Earth's axis symmetry varies throughout the year.
Now heres a whole other thing to pick on. Not only does the sun orbit, the radius of it's orbit changes!
how does the sun:
a. Manage to light up approximate half of the world at any given time.
b. manage to stay in orbit.
c. manage to change the radius of the orbit in comparison to the earth's "axis of symmetry" (aka north pole.)
It goes back to the original question.