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Re: equinox
From: Jim Thompson
Date: 2004 Mar 26, 06:35 -0400
From: Jim Thompson
Date: 2004 Mar 26, 06:35 -0400
George Huxtable clarified: "Jim Thompson provided a useful explanation, but he has got a bit tied up (I think) with some terminology about the Sun. We are used to using the words Mean Sun and Apparent Sun, to describe the differences between Mean and Apparent Time, in which the Mean Sun is an invention that goes round the sky at a uniform speed. But I think that's not the sense in which Jim Thomson is using those terms. I hope I am not misunderstanding him." No, you were right on the mark as usual, George, and as usual I am deeply impressed with your diplomacy. I had mixed up two very weakly related analogies from two very different coordinate systems. I gave up on the way I had been struggling to explain it, and instead spent more time learning about the ecliptic coordinate system. I think that now I have a clearer summary: http://jimthompson.net/boating/CelestialNav/CelestNotes/Coordinates.htm Jim Thompson jim2@jimthompson.net www.jimthompson.net Outgoing mail scanned by Norton Antivirus -----------------------------------------
