History of Astronomy |
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... at the rateof 52".1 everyyear, was necessary forthe progressof accurate astronomical observations.Itisdue toa steadyrevolution of theearth's pole roundthepole of theeclipticonce in 26,000years in the opposite direction to theplanetary ...
... at the rateof 52".1 everyyear, was necessary forthe progressof accurate astronomical observations.Itisdue toa steadyrevolution of theearth's pole roundthepole of theeclipticonce in 26,000years in the opposite direction to theplanetary ...
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... atthe lowerend of the passage wouldbe ableto see γDraconis, thethen polestar, atits lower culmination. [1] It has been suggested thatthe passage was madefor this purpose. On other groundsthe dateassigned to theGreat Pyramid is 2123 B.C. ...
... atthe lowerend of the passage wouldbe ableto see γDraconis, thethen polestar, atits lower culmination. [1] It has been suggested thatthe passage was madefor this purpose. On other groundsthe dateassigned to theGreat Pyramid is 2123 B.C. ...
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... at the apparent motions showswhy each planet, when nearest tothe earth, seems to move foratime ina retrograde direction. The attempts of Ptolemy andothers ofhis time to explain the retrograde motion in thisway wereonly approximate ...
... at the apparent motions showswhy each planet, when nearest tothe earth, seems to move foratime ina retrograde direction. The attempts of Ptolemy andothers ofhis time to explain the retrograde motion in thisway wereonly approximate ...
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... at the sun, and toextend the same system to the major planets. Something ofthis sort had been proposedbythe Egyptians (weare told by Cicero and others), and was accepted by Tycho Brahe; and was as true a representation of the relative ...
... at the sun, and toextend the same system to the major planets. Something ofthis sort had been proposedbythe Egyptians (weare told by Cicero and others), and was accepted by Tycho Brahe; and was as true a representation of the relative ...
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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