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
... passes over equal arcs on the equant in equal times . He then computed tables for predicting the place of the sun . He proceeded in the same way to compute Lunar tables . Making use of Chaldæan eclipses , he was able to get an accurate ...
... passes over equal arcs on the equant in equal times . He then computed tables for predicting the place of the sun . He proceeded in the same way to compute Lunar tables . Making use of Chaldæan eclipses , he was able to get an accurate ...
Page 22
... passing through the sun , and to be between the earth and the sun . The centres of the epicycles of Mars , Jupiter , and Saturn were supposed to be further away than the sun . Mercury and Venus were supposed to revolve in their ...
... passing through the sun , and to be between the earth and the sun . The centres of the epicycles of Mars , Jupiter , and Saturn were supposed to be further away than the sun . Mercury and Venus were supposed to revolve in their ...
Page 28
... pass through the sun , and the lines of apses do not pass through to the sun . Such was the theory advanced by Copernicus : The earth moves in an epicycle , on a deferent whose centre is a little distance from the sun . The planets move ...
... pass through the sun , and the lines of apses do not pass through to the sun . Such was the theory advanced by Copernicus : The earth moves in an epicycle , on a deferent whose centre is a little distance from the sun . The planets move ...
Page 42
... pass through the sun ; his second was that the line of apses of each planet passes through the sun ; both were contradictory to the Copernican theory . He proceeds cautiously with his propositions until he arrives at his great laws ...
... pass through the sun ; his second was that the line of apses of each planet passes through the sun ; both were contradictory to the Copernican theory . He proceeds cautiously with his propositions until he arrives at his great laws ...
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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