object rotation

General physics and astronomy discussions not directly related to Celestia
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billybob884
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object rotation

Post #1by billybob884 » 31.08.2003, 20:06

It seems to me that, as far as i've looked, all objects rotate clockwise. Weather it's their axis, or their orbit path, its always in one direction. I haven't verifyed this, but basically what I'm trying to ask is, is it possible for an object to rotate conterclockwise? And if so, how would it be done in Celestia? Maybe a negetive number for rotation period? Or is it not possible yet?
Mike M.

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ElPelado
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Post #2by ElPelado » 31.08.2003, 20:23

have you cheked the rotation of Venus???
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granthutchison
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Post #3by granthutchison » 31.08.2003, 22:30

Two ways to generate an anticlockwise rotation - either specify a negative rotation period, or tip the rotation axis by more than 90 degrees. In Celestia, the convention is that all objects rotate clockwise when viewed from above their north pole (ie the top of the applied texture) - so you'll find that Venus, Uranus, Triton, Pluto and some asteroids have Obliquities of more than 90 degrees.

Grant

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Post #4by JackHiggins » 31.08.2003, 22:48

Isn't prograde (earth-type) rotation counterclockwise, when viewed looking down on the north pole...? :?
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Guest

Post #5by Guest » 31.08.2003, 23:30

Oops! I guess I wrote it backwards

Topic author
billybob884
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Post #6by billybob884 » 31.08.2003, 23:32

the above post was me
Mike M.



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JackHiggins
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Post #7by JackHiggins » 01.09.2003, 00:06

Actually I was correcting grant's post - I didn't notice you'd done that too!
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Post #8by granthutchison » 01.09.2003, 11:38

I blame Mike ... :wink:
Grant


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