9-11-07 - Celestial sphere is revolving around an axis But...

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9/11/07 Celestial sphere is revolving around an axis. But earth is not revolving around this axis. Terrestrial latitudes simply reflect the celestial latitudes. Terrestrial equator also reflects celestial equator. o Power mathematical modle and gives you a framework or platform within to place other astronomical problem or issues (the two sphere view of the heavens) What did Greek astronomers recon was the relation between the above mathematical model and the actual real structure of the universe. o Did believe that stars were on the surface of the celestial bodies o This does represent somewhat what they believe actually exists. o Two sphere model is so useful as a mathematical model and this leads the philosophers to believe that there must be some truth to it because it works so well. (4 th centurty B.C.E.) The ambition to be comprehensive – to incorporate all astronomical phenomena into your model, everything that you possibly could. This requires paying attention to the things these philosophers felt they had to explain o Identified phenomena of inequality of the seasons, sun took longer to traverse some quadrants of ecliptic circle. This worried Greek philosophers for some reasons, never had worried the Babylonian astronomers who treated the seasons as if they were essentially all the same length.
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