History of Astronomy |
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... theearth's pole roundthepole of theeclipticonce in 26,000years in the opposite direction to theplanetary revolutions. Hipparchus wasalso the inventor of trigonometry, both plane and spherical. He explained the method of using eclipses.
... theearth's pole roundthepole of theeclipticonce in 26,000years in the opposite direction to theplanetary revolutions. Hipparchus wasalso the inventor of trigonometry, both plane and spherical. He explained the method of using eclipses.
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George Forbes. plane and spherical. He explained the method of using eclipses for determining the longitude. In connection with Hipparchus' great discoveryit may be mentioned that modern astronomers have oftenattempted to fix dates in ...
George Forbes. plane and spherical. He explained the method of using eclipses for determining the longitude. In connection with Hipparchus' great discoveryit may be mentioned that modern astronomers have oftenattempted to fix dates in ...
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... explain the unequal motions ofthe sunandmoon. Headoptedthe epicyclesand deferents which had beenusedby Apollonius andothers to explain the retrograde motionsof the planets. We, who know thatthe earth revolves roundthe sun once in a year ...
... explain the unequal motions ofthe sunandmoon. Headoptedthe epicyclesand deferents which had beenusedby Apollonius andothers to explain the retrograde motionsof the planets. We, who know thatthe earth revolves roundthe sun once in a year ...
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... explain easilywhythey, and especiallyMars, seem somuch brighter in opposition. ForMars would thenbea great deal nearer tothe earth than at other times. It wouldalso explain the retrograde motion of planets when in opposition. We must ...
... explain easilywhythey, and especiallyMars, seem somuch brighter in opposition. ForMars would thenbea great deal nearer tothe earth than at other times. It wouldalso explain the retrograde motion of planets when in opposition. We must ...
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... explaining 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 ...
... explaining 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 ...
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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 sunÂspot supposed surface telescope terrestrial thatthe theearth themoon theory thesame thesolar thesun tobe tothe Tycho Brahe Uranus velocity Venus Verrier William Herschel withthe zenith