History of Astronomy |
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... heavens—i.e.,he measured theobliquityof the ecliptic, making it23°51', confirming our knowledge ofits continuous diminution during historical times. He measured an arc of meridian, from Alexandria to Syene (Assuan), and found the ...
... heavens—i.e.,he measured theobliquityof the ecliptic, making it23°51', confirming our knowledge ofits continuous diminution during historical times. He measured an arc of meridian, from Alexandria to Syene (Assuan), and found the ...
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... heavens wherethe ecliptic is 90° from the polesof 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 ...
... heavens wherethe ecliptic is 90° from the polesof 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 ...
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... heavens toareal daily rotation of the earth aboutits axis, in the oppositedirection tothe apparent motion ofthe stars. Also in thewritings of MartianusCapella he learnt thatthe Egyptians hadsupposed Mercuryand Venus torevolve round ...
... heavens toareal daily rotation of the earth aboutits axis, in the oppositedirection tothe apparent motion ofthe stars. Also in thewritings of MartianusCapella he learnt thatthe Egyptians hadsupposed Mercuryand Venus torevolve round ...
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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 sunspot supposed surface telescope terrestrial thatthe theearth themoon theory thesame thesolar thesun tobe tothe Tycho Brahe Uranus velocity Venus Verrier William Herschel withthe zenith