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There is another factor in this that I hadn't considered either. The "apparent" rotation of the moon. I have just run that morning through Starry Night and it is quite easy to see the effect with the moon moving at a different angle to Uranus (use the RA and DEC grid as a reference) and the "apparent" rotation of the moon as it moves from east to west. Due to this rotation the "top" reference mountain will be moving away from Uranus adding to the "dropping away" effect . Make sure you use the moon as your "center" point and not Uranus. If you use Uranus as the "center" point you get the "dropping away" effect.
Last edited by [1ponders]; 10-09-2006 at 12:31 PM.
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