History of Astronomy |
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... onthe planetary motions, and held that the earth is fixed inthe centre of the universe. He adopted the excentric andequant of Hipparchus to explain the unequal motions ofthe sunandmoon. Headoptedthe epicyclesand deferents which had ...
... onthe planetary motions, and held that the earth is fixed inthe centre of the universe. He adopted the excentric andequant of Hipparchus to explain the unequal motions ofthe sunandmoon. Headoptedthe epicyclesand deferents which had ...
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... onthe latter theorythe stars oughttoseemto move when the earth changes its position—a testwhich failed completely with the rough means of observationthen available.The radical defect ofallsolar systems previous to thetimeofKepler (1609 ...
... onthe latter theorythe stars oughttoseemto move when the earth changes its position—a testwhich failed completely with the rough means of observationthen available.The radical defect ofallsolar systems previous to thetimeofKepler (1609 ...
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... on the poles of the ecliptic once a year ... Copernicus did not know that motion inastraight line is thenaturalmotion, and thatmotion ina curve isthe resultant ofseveral movements. He believed, with Aristotle, that circular motion was ...
... on the poles of the ecliptic once a year ... Copernicus did not know that motion inastraight line is thenaturalmotion, and thatmotion ina curve isthe resultant ofseveral movements. He believed, with Aristotle, that circular motion was ...
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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 Chaldæans 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