History of Astronomy |
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Page 22
... motions of the sun and moon . He adopted the epicycles and deferents which had been used by Apollonius and others to explain the retrograde motions of the planets . We , who know that the earth revolves round the sun once in a year ...
... motions of the sun and moon . He adopted the epicycles and deferents which had been used by Apollonius and others to explain the retrograde motions of the planets . We , who know that the earth revolves round the sun once in a year ...
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
... motion , and added it to the two real motions ( rotation and orbital revolution ) . By this third motion the earth ... retrograde ( ie . , opposite to the orbital revolution ) , and by making it perform more than one complete revolution ...
... motion , and added it to the two real motions ( rotation and orbital revolution ) . By this third motion the earth ... retrograde ( ie . , opposite to the orbital revolution ) , and by making it perform more than one complete revolution ...
Page 66
... motion of both was 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 ...
... motion of both was 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 ...
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accepted accurate ancient appear astronomers attraction bodies bright calculations called catalogue cause centre century Chinese circle comet compared complete Copernicus determined diameter direction discovered discovery distance earth eclipse effect elements enabled epicycles equal error explain fact fixed follow force four Galileo gave give given gravitation heavens held Herschel increased interesting Jupiter Kepler knowledge known later LIBRARIES light lunar Mars mass mathematical mean measured method miles moon moon's motion move Newton noticed object observations Observatory opposition orbit original parallax pass period photographic physical planet planetary pole position predicted progress proper motion proved records researches revolve ring rotation round Royal satellites seems seen showed SIGILLUM solar system spectroscope spectrum stars studied sun's supposed surface tables telescope theory tion trace true Tycho Brahe UNIVERSITY VERITAS