Orrery

Click Tychonian and then Trace Planet to see the epicycles!

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6 Responses:

  1. If only Galileo had Flash.

    This will make an awesome hack for xscreensaver.

  2. Otto says:

    FF to July 2079 for a really close planetary alignment. :)

  3. Joshua says:

    This is a pretty good tutorial for explaining how retrograde motion happens.

  4. Glaurung_quena says:

    Sigh, if only it also had a Ptolemaic option...