History of Astronomy |
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Page 19
... catalogue all the principal stars so as to know if any others appeared or disappeared . Here his experiences resembled those of several later astronomers , who , when in search of some special object , have been rewarded by a discovery ...
... catalogue all the principal stars so as to know if any others appeared or disappeared . Here his experiences resembled those of several later astronomers , who , when in search of some special object , have been rewarded by a discovery ...
Page 24
... catalogue of stars , the first since the time of Hipparchus . At the close of the fifteenth century King Alphonso of Spain employed computers to produce the Alphonsine Tables ( 1488 A.D. ) , Purbach translated Ptolemy's book , and ...
... catalogue of stars , the first since the time of Hipparchus . At the close of the fifteenth century King Alphonso of Spain employed computers to produce the Alphonsine Tables ( 1488 A.D. ) , Purbach translated Ptolemy's book , and ...
Page 35
... catalogues , his probable error in right ascension is only 24 " , 1 , and in declination only ± 25 ′′ , 9 . Clocks of a sort had been made , but Tycho Brahe found them so unreliable that he seldom used them , and many of his position ...
... catalogues , his probable error in right ascension is only 24 " , 1 , and in declination only ± 25 ′′ , 9 . Clocks of a sort had been made , but Tycho Brahe found them so unreliable that he seldom used them , and many of his position ...
Page 36
... catalogue all the principal stars , so that there should be no mistake in the future . During the construction of his catalogue of 1,000 stars he prepared and used accurate tables of refraction deduced from his own observations . Thus ...
... catalogue all the principal stars , so that there should be no mistake in the future . During the construction of his catalogue of 1,000 stars he prepared and used accurate tables of refraction deduced from his own observations . Thus ...
Page 61
... was made when he went to St. Helena to catalogue the southern stars . He measured the change Born 1736 ; died 1813 . 2 Born 1749 ; died 1827 . in length of the second's pendulum in different latitudes due THE DYNAMICAL PERIOD 61.
... was made when he went to St. Helena to catalogue the southern stars . He measured the change Born 1736 ; died 1813 . 2 Born 1749 ; died 1827 . in length of the second's pendulum in different latitudes due THE DYNAMICAL PERIOD 61.
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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