History of Astronomy |
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Page 22
He adopted the excentric and equant of Hipparchus to explain the unequal
motions of the sun and moon. He adopted the epicycles and deferents which had
been used by Apollonius and others to explain the retrograde motions of the
planets.
He adopted the excentric and equant of Hipparchus to explain the unequal
motions of the sun and moon. He adopted the epicycles and deferents which had
been used by Apollonius and others to explain the retrograde motions of the
planets.
Page 27
To use the words of Delambre,1 in drawing attention to the strange conception,
he imagined that the earth, revolving round the sun, ought always to show to it
the same face ; the contrary phenomena surprised him : to explain them he
invented ...
To use the words of Delambre,1 in drawing attention to the strange conception,
he imagined that the earth, revolving round the sun, ought always to show to it
the same face ; the contrary phenomena surprised him : to explain them he
invented ...
Page 60
He found that to explain these eclipses Halley's suggestion must be adopted^the
acceleration being- -k>"-4« one century. In 1757 Lalande again fixed it at 10."
The Paris Academy, in 1770, offered their prize for an investigation to see if this ...
He found that to explain these eclipses Halley's suggestion must be adopted^the
acceleration being- -k>"-4« one century. In 1757 Lalande again fixed it at 10."
The Paris Academy, in 1770, offered their prize for an investigation to see if this ...
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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 |