Biographies of Distinguished Scientific Men volume 1
Biographies of Distinguished Scientific Men volume 1
F Franois Arago
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sphere was then wanted to account for a movement in which all the stars participated at the same time. Copernicus having deprived the earth of its alleged immobility, gave a very simple explanation of the most minute circumstances of precession. He supposed that the axis of rotation does not remain exactly parallel to itself; that in the course of each complete revolution of the earth around the sun, the axis deviates from its posi- tion by a small quantity ; in a word, instead of supposing the... circum polar stars to advance in a certain way towards the pole, he makes the pole advance towards the stars. This hypothesis divested the mechanism of the universe of the greatest complication which the love of theorizing had introduced into it. A new Alphonse would have then wanted a pretext to address to his astronomical synod the profound remark, so erroneously interpreted, which history ascribes to the king of Castile. If the conception of Copernicus improved by Kepler had, as we have just seen, introduced a striking im- provement into the mechanism of the heavens, it still remained to discover the motive force which, by altering the position of the terrestrial axis during each successive, year, would cause it to describe an entire circle of nearly 50 in diameter, in a period of about 26, 000 years.
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