History of Astronomy |
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... retrograde direction. The attempts of Ptolemy andothers ofhis time to explain the retrograde motion in thisway wereonly approximate. Letus suppose each planet to have abar with one end centred at the earth. If at theother endof the bar ...
... retrograde direction. The attempts of Ptolemy andothers ofhis time to explain the retrograde motion in thisway wereonly approximate. Letus suppose each planet to have abar with one end centred at the earth. If at theother endof the bar ...
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... retrograde motion of planets when in opposition. We must here notice thatat this stage Copernicus was actually confronted with thesystem acceptedlater byTycho Brahe, withthe earth fixed.Buthe nowrecalled and accepted the views of ...
... retrograde motion of planets when in opposition. We must here notice thatat this stage Copernicus was actually confronted with thesystem acceptedlater byTycho Brahe, withthe earth fixed.Buthe nowrecalled and accepted the views of ...
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... retrograde motion,as thePtolemaic theory did.Furthermore, either systemcould use theexcentric of Hipparchus to explain theirregular motion knownas theequation of the centre. But Copernicus remarked that he could alsouse an epicycle ...
... retrograde motion,as thePtolemaic theory did.Furthermore, either systemcould use theexcentric of Hipparchus to explain theirregular motion knownas theequation of the centre. But Copernicus remarked that he could alsouse an epicycle ...
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... retrograde (i.e., opposite to the orbital revolution), and by making it performmore than one complete revolutionin ayear, the added partbeing 1/26000 of the whole, he was able to include the precession of the equinoxes inhisexplanation ...
... retrograde (i.e., opposite to the orbital revolution), and by making it performmore than one complete revolutionin ayear, the added partbeing 1/26000 of the whole, he was able to include the precession of the equinoxes inhisexplanation ...
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Airy allthe andthat andthe asthe Astronomer Royal Astronomia Nova astronomical units atmosphere atthe attraction axis bright bythe calculations catalogue centre century Chaldĉans Chinese comet confirmed Copernicus detected diameter discovered discovery distance earth eclipse epicycles equatoreal excentric explain fixed stars FOOTNOTES Frauenhofer fromthe Galileo Greenwich Halley havebeen heavenly bodies heavens heliometer Herschel Hipparchus Huggins hydrogen hypotheses inequality instruments inthe isthe John Herschel Jupiter Jupiter's Kepler lawof Lick Observatory light lines lunar Mars mathematical mean motion measured Mercury meteor miles moon moon's nebula Newton ofthese onthe orbit parallax perihelion period photographic physical planet planetary position predicted proper motion Ptolemy records reflector refractor retrograde retrograde motion revolve rotation round satellites Saturn seems solar system spectra spectroscope spectrum spots stellar sun's sunspot supposed surface telescope terrestrial thatthe theearth themoon theory thesame thesolar thesun tobe tothe Tycho Brahe Uranus velocity Venus Verrier William Herschel withthe zenith