Some things I'm particularly looking for

• sun/earth/moon orbits resulting in phases of the moon

  • pretty good http://jove.geol.niu.edu/faculty/stoddard/JAVA/moonphase.html

• sun/earth orbits with changing angle of the earth, resulting in seasons

  • this is a bit lame, but gives you a sense of it

  • this is another perspective

• entire Solar System orbits together

Here's a big list

John Walker made some stuff.

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