History of Astronomy |
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Page 18
... line from the earth to the " excentric " was called the line of apses . A circle having this centre was called the equant , and he supposed that a radius drawn to the sun from the excentric passes over equal arcs on the equant in equal ...
... line from the earth to the " excentric " was called the line of apses . A circle having this centre was called the equant , and he supposed that a radius drawn to the sun from the excentric passes over equal arcs on the equant in equal ...
Page 23
... of the excentric3 from the centre of the deferent , and the position of the For definition see p . 22 . 3 For definition see p . 18 . 2 Ibid . C line of apses , ' besides the inclination and position THE GEOMETRICAL PERIOD 23.
... of the excentric3 from the centre of the deferent , and the position of the For definition see p . 22 . 3 For definition see p . 18 . 2 Ibid . C line of apses , ' besides the inclination and position THE GEOMETRICAL PERIOD 23.
Page 24
George Forbes. line of apses , ' besides the inclination and position of the plane of the planet's orbit . The only object ever aimed at in those days was to prepare tables for predicting the places of the planets . It was not a ...
George Forbes. line of apses , ' besides the inclination and position of the plane of the planet's orbit . The only object ever aimed at in those days was to prepare tables for predicting the places of the planets . It was not a ...
Page 41
... line of apses . The ratio of CS to CA is the exccntricity . The position of the planet at A is the perihelion ( nearest to the sun ) . The position of the planet at B is the aphelion ( farthest from the sun ) . The angle ASP is the ...
... line of apses . The ratio of CS to CA is the exccntricity . The position of the planet at A is the perihelion ( nearest to the sun ) . The position of the planet at B is the aphelion ( farthest from the sun ) . The angle ASP is the ...
Page 42
... 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 , and he concludes his book by comparing ...
... 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 , and he concludes his book by comparing ...
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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