History of Astronomy |
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Page 23
... for the constants involved — viz., the periods of revolution, the diameter of the
deferent,1 and its ratio to that of the epicycle,2 the distance of the excentrics from
the centre of the deferent, and the position of the 1 For definition see p. 22. 2 Ibid.
... for the constants involved — viz., the periods of revolution, the diameter of the
deferent,1 and its ratio to that of the epicycle,2 the distance of the excentrics from
the centre of the deferent, and the position of the 1 For definition see p. 22. 2 Ibid.
Page 68
Altogether, nineteen observations of Uranus's position, from the time of
Flamsteed, in 1690, had been recorded. In 1790 Delambre, using all these
observations, prepared tables for computing its position. These worked well
enough for a time, ...
Altogether, nineteen observations of Uranus's position, from the time of
Flamsteed, in 1690, had been recorded. In 1790 Delambre, using all these
observations, prepared tables for computing its position. These worked well
enough for a time, ...
Page 69
George Forbes. which as an undergraduate he had set himself — to see whether
the disturbances of Uranus could be explained by assuming a certain orbit, and
position in that orbit, _ of a hypothetical planet even more distant than Uranus.
George Forbes. which as an undergraduate he had set himself — to see whether
the disturbances of Uranus could be explained by assuming a certain orbit, and
position in that orbit, _ of a hypothetical planet even more distant than Uranus.
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Contents
Ancient AstronomyChinese and Chaldeans | 7 |
Ancient Greek Astronomy | 13 |
The Reign of Epicycles From Ptolemy | 23 |
3 other sections not shown
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Common terms and phrases
accurate observations Airy ancient astro Astronomer Royal astronomical units attraction axis bright calculations Cape Cassini catalogue centre century Chinese comet compute Copernicus diameter discovered discovery earth eclipse Egyptian epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley Halley's comet heavenly bodies heavens heliometer Hipparchus Huggins hydrogen hypothesis instruments Johann Kepler John Herschel Jupiter Jupiter's Kepler Lick Observatory light line of sight lunar Mars mathematical mean distance mean motion measured Mercury meteor miles a second moon moon's nebula Newton nodes noticed Observatory orbit parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil recognised records refractor retrograde retrograde motion revolve round ring rotation satellites seems seen showed Sirius solar system spectra spectroscope spectrum sphere spots stellar sun-spots supposed tables telescope theory tion Trans Tycho Brahe Uranus velocity Venus Verrier zenith
Bibliographic information
| Title | History of Astronomy The history of science series |
| Author | George Forbes |
| Publisher | Watts, 1921 |
| Original from | Indiana University |
| Digitized | 5 Aug 2010 |
| Length | 150 pages |
| Export Citation | BiBTeX EndNote RefMan |