How do I open the Planet Door?

Hint 1 of 9:

Ignore the symbols and concentrate on light and dark sides.

Hint 2 of 9:

The planets do not need to be aligned in a single line.

Hint 3 of 9:

Align all the planets with the light side up.

Hint 4 of 9:

The dividing line between light and dark on each planet disk needs to be
absolutely horizontal.