History of Astronomy |
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Page 8
... epicycles failed to match the planets' movements. Soon they began adding epicycles to epicycles and things were beginning to look too complicated to be sensible. Some people found a different way of interpreting planetary motion, with ...
... epicycles failed to match the planets' movements. Soon they began adding epicycles to epicycles and things were beginning to look too complicated to be sensible. Some people found a different way of interpreting planetary motion, with ...
Page 14
... Epicycle . given fome Idea ) ; and these I fuppofe Ellipfis's , and their Pofitions thus ; that their greater Axis's are in a Right - Line from the Centers of the Axicycles through the Centers of the Epicycles . $ LXX . I place the ...
... Epicycle . given fome Idea ) ; and these I fuppofe Ellipfis's , and their Pofitions thus ; that their greater Axis's are in a Right - Line from the Centers of the Axicycles through the Centers of the Epicycles . $ LXX . I place the ...
Page 3
... epicycles in the orbit of the object . Thus , there would be increasing fiery contamination of those objects which had more epicycles . Now , aether was unchanging and eternal while fire was changing all the time . Thus the Moon , which ...
... epicycles in the orbit of the object . Thus , there would be increasing fiery contamination of those objects which had more epicycles . Now , aether was unchanging and eternal while fire was changing all the time . Thus the Moon , which ...
Page 9
... epicycles . The diameters of the spheres and the epicycles ( cf. explanation of Fig . 1 ) are represented approximately on the scale of the logarithms of their dimensions , as estimated by Alfraganus . The centres of all the epicycles ...
... epicycles . The diameters of the spheres and the epicycles ( cf. explanation of Fig . 1 ) are represented approximately on the scale of the logarithms of their dimensions , as estimated by Alfraganus . The centres of all the epicycles ...
Page 16
... epicycles ; these epicycles were superim- posed on the larger orbit that was centered on the Earth . It was a complex model , and to make things worse astrono- mers eventually found that simple epicycles weren't enough ; they needed ...
... epicycles ; these epicycles were superim- posed on the larger orbit that was centered on the Earth . It was a complex model , and to make things worse astrono- mers eventually found that simple epicycles weren't enough ; they needed ...
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Common terms and phrases
accurate observations Airy astro Astronomer Royal Astronomia Nova astronomical units attraction axis bright calculations Cape Cassini catalogue centre century comet compute Copernicus diameter discovered discovery earth eclipse epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus Huggins hydrogen hypothesis instruments Johann Kepler John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance mean motion measured Mercury meteor method miles a second moon moon's nebulæ Newton Observatory orbit parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolution revolve round ring rotation round the sun satellites seems showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spots sun's surface supposed tables telescope theory tion Trans Tycho Brahe Uranus velocity Venus Verrier zenith