History of Astronomy |
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Page 17
... fixed the positions of the zodiacal stars , near to which all the planets in their orbits pass , thus facilitating the determination of planetary motions . Aristarchus ( 320-250 B.C. ) showed that THE GEOMETRICAL PERIOD 17.
... fixed the positions of the zodiacal stars , near to which all the planets in their orbits pass , thus facilitating the determination of planetary motions . Aristarchus ( 320-250 B.C. ) showed that THE GEOMETRICAL PERIOD 17.
Page 18
George Forbes. planetary motions . Aristarchus ( 320-250 B.C. ) showed that the sun must be at least nineteen times as far off as the moon , which is far short of the mark . He also found the sun's diameter , correctly , to be half a ...
George Forbes. planetary motions . Aristarchus ( 320-250 B.C. ) showed that the sun must be at least nineteen times as far off as the moon , which is far short of the mark . He also found the sun's diameter , correctly , to be half a ...
Page 37
... showed more new inequali- ties . But , as it turned out , the most fruitful work of Tycho Brahe was on the motions of the planets , and especially of the planet Mars , for it was by an examination of these results that Kepler was led to ...
... showed more new inequali- ties . But , as it turned out , the most fruitful work of Tycho Brahe was on the motions of the planets , and especially of the planet Mars , for it was by an examination of these results that Kepler was led to ...
Page 52
... showed it to his audience . The next morning , when removing his property from the lecture table , he found that his precious relic had been stolen . It would be interesting to know who has got it now ! Having developed and enunciated ...
... showed it to his audience . The next morning , when removing his property from the lecture table , he found that his precious relic had been stolen . It would be interesting to know who has got it now ! Having developed and enunciated ...
Page 56
... For a long time this was the one weak point in the Newtonian theory . It was not till 1747 that Clairaut reconciled this with the theory , and showed why Newton's exact . calculation was not Newton 56 THE DYNAMICAL PERIOD.
... For a long time this was the one weak point in the Newtonian theory . It was not till 1747 that Clairaut reconciled this with the theory , and showed why Newton's exact . calculation was not Newton 56 THE DYNAMICAL PERIOD.
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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