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Stellar Apparent Motion Question
From: FS
Date: 2004 Dec 19, 12:06 -0800
From: FS
Date: 2004 Dec 19, 12:06 -0800
Listed below are declinations of two stars tabulated every 90 days or so, from the 2005 Nautical Almanac. Alpheratz 2005 01 Jan N29?07.2 31 Mar N29?07.0 (-0.2) 30 Jun N29?07.1 (+0.1) 30 Sep N29?07.4 (+0.3) 31 Dec N29?07.6 (+0.3) Elnath 2005 01 Jan N28?36.8 ( 0.0) 31 Mar N28?36.8 ( 0.0) 30 Jun N28?36.8 ( 0.0) 30 Sep N28?36.8 ( 0.0) 31 Dec N28?36.9 (+0.1) Why does one vary first south, then north, and then not return to its "starting point"? Why does the second vary at a rate far different from the first? Is it varying parallax (from Earth's orbit) for two stars at greatly varying distances from earth? If so, why does Alpheratz not return to its starting point? Parallax from the "expanding universe"?? __________________________________ Do you Yahoo!? Yahoo! Mail - You care about security. So do we. http://promotions.yahoo.com/new_mail
