History of Astronomy |
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George Forbes. the earth is supported, just as were those who invented the myth of Atlas, or the Indians with the tortoise. Thales thought that the flat earth floated on water. Anaxagoras thought that, being flat,itwould be buoyed up and ...
George Forbes. the earth is supported, just as were those who invented the myth of Atlas, or the Indians with the tortoise. Thales thought that the flat earth floated on water. Anaxagoras thought that, being flat,itwould be buoyed up and ...
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... earth, 250,000stadia. Unfortunately, we do not know the length ofthestadium he used. Hipparchus (190120 B.C.) may beregarded ... the earth to the "excentric"wascalled thelineof apses.A circle having this centrewas called theequant,and he ...
... earth, 250,000stadia. Unfortunately, we do not know the length ofthestadium he used. Hipparchus (190120 B.C.) may beregarded ... the earth to the "excentric"wascalled thelineof apses.A circle having this centrewas called theequant,and he ...
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... the earth—i.e., theequinox. He found that thiscouldbe explainedbya motion of the equinox inthedirection ofthe apparent diurnal motion of the stars.This discovery of precession oftheequinoxes, which takesplace at the rateof 52".1 ...
... the earth—i.e., theequinox. He found that thiscouldbe explainedbya motion of the equinox inthedirection ofthe apparent diurnal motion of the stars.This discovery of precession oftheequinoxes, which takesplace at the rateof 52".1 ...
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... the earth. If at theother endof the bar one end ofa shorter bar is pivotted, having the planet at its other end,then the planet is given anannual motion in the secondary circle (the epicycle), whose centrerevolves round the earth ...
... the earth. If at theother endof the bar one end ofa shorter bar is pivotted, having the planet at its other end,then the planet is given anannual motion in the secondary circle (the epicycle), whose centrerevolves round the earth ...
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... the earth to revolve. The cumbrous systemadvocated by Ptolemyanswered its purpose, enabling himto predict astronomical events approximately. He improved the lunartheory considerably, and discovered minorinequalities which couldbe ...
... the earth to revolve. The cumbrous systemadvocated by Ptolemyanswered its purpose, enabling himto predict astronomical events approximately. He improved the lunartheory considerably, and discovered minorinequalities which couldbe ...
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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