History of Astronomy |
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Page 18
... minutes - still four minutes too much . He measured the equation of time and the irregular motion of the sun ; and allowed for this in his calculations by supposing that the centre , about which the sun moves uniformly , is situated a ...
... minutes - still four minutes too much . He measured the equation of time and the irregular motion of the sun ; and allowed for this in his calculations by supposing that the centre , about which the sun moves uniformly , is situated a ...
Page 35
... minute of arc . In view of this it is simply marvellous that , when the positions of Tycho's standard stars are compared with the best modern catalogues , his probable error in right ascension is only 24 " , 1 , and in declination only ...
... minute of arc . In view of this it is simply marvellous that , when the positions of Tycho's standard stars are compared with the best modern catalogues , his probable error in right ascension is only 24 " , 1 , and in declination only ...
Page 37
... minutes . Tycho Brahe found that the tables of Copernicus were in error as much as two degrees . He re - discovered the inequality called " variation " by observing the moon in all phases — a thing which had not been attended to . [ It ...
... minutes . Tycho Brahe found that the tables of Copernicus were in error as much as two degrees . He re - discovered the inequality called " variation " by observing the moon in all phases — a thing which had not been attended to . [ It ...
Page 40
... minutes of a degree . Then he said boldly that it was impossible that so good an observer as Tycho could have made a mistake of eight minutes , and 40 THE DYNAMICAL PERIOD.
... minutes of a degree . Then he said boldly that it was impossible that so good an observer as Tycho could have made a mistake of eight minutes , and 40 THE DYNAMICAL PERIOD.
Page 41
George Forbes. could have made a mistake of eight minutes , and added : " Out of these eight minutes we will construct a new theory that will explain the motions of all the planets . " . And he did it , with elliptic orbits having the ...
George Forbes. could have made a mistake of eight minutes , and added : " Out of these eight minutes we will construct a new theory that will explain the motions of all the planets . " . And he did it , with elliptic orbits having the ...
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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