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Page viii
... hypotheses as true , have founded upon these discoveries a science as exact in its observation of facts as in theories . So it is that these men , who have built up the most sure and most solid of all the sciences , refuse to invite ...
... hypotheses as true , have founded upon these discoveries a science as exact in its observation of facts as in theories . So it is that these men , who have built up the most sure and most solid of all the sciences , refuse to invite ...
Page ix
... hypotheses of many well- known astronomers of to - day cannot be included among the records of the History of Astronomy . The writer regrets the necessity that thus arises of leaving without mention the names of many who are now making ...
... hypotheses of many well- known astronomers of to - day cannot be included among the records of the History of Astronomy . The writer regrets the necessity that thus arises of leaving without mention the names of many who are now making ...
Page 28
... , historiam motuum cœlestium diligenti et artificiosa observatione colligere . Deinde causas earundem , seu hypotheses , cum veras assequi nulla ratione says that whoever is not satisfied with this explanation must 28 THE GEOMETRICAL ...
... , historiam motuum cœlestium diligenti et artificiosa observatione colligere . Deinde causas earundem , seu hypotheses , cum veras assequi nulla ratione says that whoever is not satisfied with this explanation must 28 THE GEOMETRICAL ...
Page 29
... hypotheses esse veras , imo ne verisimiles quidem , sed sufficit hoc usum , si calculum observationibus congruentem exhibeant . " that a revolution had been effected when Pythagoras ' system THE GEOMETRICAL PERIOD 29.
... hypotheses esse veras , imo ne verisimiles quidem , sed sufficit hoc usum , si calculum observationibus congruentem exhibeant . " that a revolution had been effected when Pythagoras ' system THE GEOMETRICAL PERIOD 29.
Page 38
... hypothesis he used a modification of an old Egyptian theory , mathematically identical with . that of Copernicus , but not involving a stellar parallax . He says ( De Mundi , etc. ) that the Ptolemean system was too complicated , and ...
... hypothesis he used a modification of an old Egyptian theory , mathematically identical with . that of Copernicus , but not involving a stellar parallax . He says ( De Mundi , etc. ) that the Ptolemean system was too complicated , 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