History of Astronomy |
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... Hipparchus, about 150B.C., and Ptolemy alittlelater, were abletousethe observations of Chaldĉan astrologers, as well asthoseof Alexandrian astronomers, and to make some discoveries which havehelped theprogressof astronomy in allages. So ...
... Hipparchus, about 150B.C., and Ptolemy alittlelater, were abletousethe observations of Chaldĉan astrologers, as well asthoseof Alexandrian astronomers, and to make some discoveries which havehelped theprogressof astronomy in allages. So ...
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... Hipparchus observed anewstar. This upsetevery notion about the permanence ofthefixed stars. He then set to work to catalogue all the principal stars so as toknow ifanyothers appeared or disappeared. Here his experiences resembled those ...
... Hipparchus observed anewstar. This upsetevery notion about the permanence ofthefixed stars. He then set to work to catalogue all the principal stars so as toknow ifanyothers appeared or disappeared. Here his experiences resembled those ...
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... Hipparchus' great discoveryit may be mentioned that modern astronomers have oftenattempted to fix dates in history bytheeffects of precessionof the equinoxes. (1) At about the date when the Great Pyramid may have been builtγDraconis ...
... Hipparchus' great discoveryit may be mentioned that modern astronomers have oftenattempted to fix dates in history bytheeffects of precessionof the equinoxes. (1) At about the date when the Great Pyramid may have been builtγDraconis ...
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... Hipparchus to 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 ...
... Hipparchus to 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 ...
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... Hipparchus, asthe responses of these astronomers to the demand of Plato for uniform circular motions. Their use became more andmore confirmed, untilthe seventeenth century, whenthe accurate observations of Tycho Brahe enabled Keplerto ...
... Hipparchus, asthe responses of these astronomers to the demand of Plato for uniform circular motions. Their use became more andmore confirmed, untilthe seventeenth century, whenthe accurate observations of Tycho Brahe enabled Keplerto ...
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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