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 ... earth. He called this point the excentric. The line from the earth to the "excentric"wascalled thelineof apses.A circle ...
... earth, 250,000stadia. Unfortunately, we do not know the length ofthestadium he used. Hipparchus (190120 B.C.) may ... earth. He called this point the excentric. The line from the earth to the "excentric"wascalled thelineof apses.A circle ...
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... 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 everyyear ...
... 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 everyyear ...
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... earth revolves roundthe sun once in a year, can understand thatthe apparent motionofa planetisonly its motionrelative tothe earth. If, then,we suppose theearth fixed andthesun to revolve round it onceayear, and the planets eachin its ...
... earth revolves roundthe sun once in a year, can understand thatthe apparent motionofa planetisonly its motionrelative tothe earth. If, then,we suppose theearth fixed andthesun to revolve round it onceayear, and the planets eachin its ...
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... 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 allowed ...
... 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 allowed ...
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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