History of Astronomy |
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Page 22
... retrograde motions of the planets . We , who know that the earth revolves round the sun once in a year , can ... retrograde direction . The attempts of Ptolemy and others of his time to explain the retrograde motion in this way were only ...
... retrograde motions of the planets . We , who know that the earth revolves round the sun once in a year , can ... retrograde direction . The attempts of Ptolemy and others of his time to explain the retrograde motion in this way were only ...
Page 25
... retrograde motion of planets when in opposition . We must here notice that at this stage Copernicus was actually confronted with the system accepted later by Tycho Brahe , with the earth fixed . But he now recalled and accepted the ...
... retrograde motion of planets when in opposition . We must here notice that at this stage Copernicus was actually confronted with the system accepted later by Tycho Brahe , with the earth fixed . But he now recalled and accepted the ...
Page 26
... retrograde motion , as the Ptolemaic theory did . Furthermore , either system could use the excentric of Hipparchus to explain the irregular motion known as the equation of the centre . But Copernicus remarked that he could also use an ...
... retrograde motion , as the Ptolemaic theory did . Furthermore , either system could use the excentric of Hipparchus to explain the irregular motion known as the equation of the centre . But Copernicus remarked that he could also use an ...
Page 27
... retrograde ( i.e. , opposite to the orbital revolution ) , and by making it perform more than one complete revolution in a year , the added part being too of the whole , he was able to include the precession of the equinoxes in his ...
... retrograde ( i.e. , opposite to the orbital revolution ) , and by making it perform more than one complete revolution in a year , the added part being too of the whole , he was able to include the precession of the equinoxes in his ...
Page 66
... retrograde . In 1772 , before Herschel's discovery , Bode1 had dis- covered a curious arbitrary law of planetary distances . Opposite each planet's name write the figure 4 ; and , in succession , add the numbers 0 , 3 , 6 , 12 , 24 , 48 ...
... retrograde . In 1772 , before Herschel's discovery , Bode1 had dis- covered a curious arbitrary law of planetary distances . Opposite each planet's name write the figure 4 ; and , in succession , add the numbers 0 , 3 , 6 , 12 , 24 , 48 ...
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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