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Constellations convenient for sectioning the grand cellestial sphere into
manageable, recognizeable pieces. Back in 1930 astronomers snapped some chalk lines on the sky, got out their jigsaws and cut out some formal constellation boundaries. They were pretty smart about it -- "they lie along the meridians of right ascension and parallels of declination for the mean equator and equinox of 1875.0" according to: http://www.iau.org/IAU/Activities/no...ure/const.html Looking at The Cambridge Star Atlas 3rd Edition which is based on the 2000.0 catalogues it's pretty obvious that the old border boundaries are no longer convenient. Just look at the UMi boundary closest to the pole! It seems to be a circular arc centered on absolutely nothing pertinent today. To accurately determine which constellation an object is located in today one must translate back to the 1875 frame. How about some new formal boundaries along the meridians of right ascension and parallels of declination for the mean equator and equinox of 2000.0? Surely there's gotta be some good grant money available for that kind of thing. Regards, -- Mark Mark Lepkowski Email: webmaster at mclTunes dot-com http://www.mcltunes.com |
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