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It's simple, really. Up is the direction away from the sphere if that sphere is the primary gravitational influence. This up gets normalized to the center pole of the celestial sphere, the pin about which the celestial sphere rotates. In the northern hemisphere this is the Pole Star, in the southern hemisphere there is no star quite that close to the preferred spot, but the celestial sphere does rotate about a point to the south that is the definitive up. If you get close enough to the equator you'll find that cultural definitions of up, as shown on maps, will be in other directions, usually based on some important city.
(with apologies to ron o.)
Entire Thread Subject Posted By Posted Red Skies Wordwind 03/07/03 10:35 PM Re: Red Skies Jackie 03/07/03 11:08 PM Re: Red Skies Wordwind 03/07/03 11:19 PM Re: Red Skies Buffalo Shrdlu 03/07/03 11:26 PM Re: Ol' Joe Clark Wordwind 03/07/03 11:35 PM Re: Ol' Joe Clark Buffalo Shrdlu 03/07/03 11:46 PM Re: Red Skies Bingley 03/08/03 01:12 AM Re: Red Skies sjm 03/08/03 02:03 AM Re: Red Skies Jackie 03/11/03 02:05 AM Re: Red Skies sjm 03/11/03 03:18 AM Re: Which way is up Faldage 03/11/03 11:33 AM
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