History of Astronomy |
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Page 10
... round the pole of the ecliptic , and for this reason the eclipses in one cycle are repeated with very slight modification in the next cycle , and so on for many centuries . It may be that the neglect of their duties by Hi and Ho , and ...
... round the pole of the ecliptic , and for this reason the eclipses in one cycle are repeated with very slight modification in the next cycle , and so on for many centuries . It may be that the neglect of their duties by Hi and Ho , and ...
Page 14
... round the sun , which itself revolves round an imaginary central fire called the Antichthon . Copernicus in the sixteenth century claimed Pythagoras as the founder of the system which he , Copernicus , revived . Anaxagoras ( born 499 ...
... round the sun , which itself revolves round an imaginary central fire called the Antichthon . Copernicus in the sixteenth century claimed Pythagoras as the founder of the system which he , Copernicus , revived . Anaxagoras ( born 499 ...
Page 16
... round by a string . Democritus further supposed that the inclination of the flat earth to the ecliptic was due to the greater weight of the southern parts owing to the exuberant vegeta- tion . For further references to similar efforts ...
... round by a string . Democritus further supposed that the inclination of the flat earth to the ecliptic was due to the greater weight of the southern parts owing to the exuberant vegeta- tion . For further references to similar efforts ...
Page 19
... round the pole of the ecliptic once in eighteen years complicated the problem . He located the moon's excentric as he had done the sun's . He also discovered some of the minor irregularities of the moon's motion , due , as Newton's ...
... round the pole of the ecliptic once in eighteen years complicated the problem . He located the moon's excentric as he had done the sun's . He also discovered some of the minor irregularities of the moon's motion , due , as Newton's ...
Page 22
... round the earth on the primary circle ( the deferent ) , at a uniform rate round the excentric . Ptolemy supposed the centres of the epicycles of Mercury and Venus to be on a bar passing through the sun , and to be between the earth and ...
... round the earth on the primary circle ( the deferent ) , at a uniform rate round the excentric . Ptolemy supposed the centres of the epicycles of Mercury and Venus to be on a bar passing through the sun , and to be between the earth and ...
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Common terms and phrases
accurate observations Airy astro Astronomer Royal Astronomia Nova astronomical units attraction axis bright calculations Cape Cassini catalogue centre century comet compute Copernicus diameter discovered discovery earth eclipse epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus Huggins hydrogen hypothesis instruments Johann Kepler John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance mean motion measured Mercury meteor method miles a second moon moon's nebulæ Newton Observatory orbit parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolution revolve round ring rotation round the sun satellites seems showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spots sun's surface supposed tables telescope theory tion Trans Tycho Brahe Uranus velocity Venus Verrier zenith