History of Astronomy |
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Page 91
He suggested that the others were due to absorption in the sun's atmosphere.
Thereupon Professor J. D. Forbes pointed out that during a nearly total eclipse
the lines ought to be strengthened in the same way ; as that part of the sun's light,
...
He suggested that the others were due to absorption in the sun's atmosphere.
Thereupon Professor J. D. Forbes pointed out that during a nearly total eclipse
the lines ought to be strengthened in the same way ; as that part of the sun's light,
...
Page 96
seen all over the sun's surface, but specially in the neighbourhood of spots, and
most distinctly near the sun's edge, were discovered by Galileo. A high telescopic
power resolves their structure into an appearance like willow-leaves, ...
seen all over the sun's surface, but specially in the neighbourhood of spots, and
most distinctly near the sun's edge, were discovered by Galileo. A high telescopic
power resolves their structure into an appearance like willow-leaves, ...
Page 135
From this it has been calculated that the mass of Sirius equals two of our suns,
and its intrinsic brightness equals twenty suns ; but the companion, having a
mass equal to our sun, has only a five-hundredth part of the sun's brightness.
From this it has been calculated that the mass of Sirius equals two of our suns,
and its intrinsic brightness equals twenty suns ; but the companion, having a
mass equal to our sun, has only a five-hundredth part of the sun's brightness.
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Contents
Ancient AstronomyChinese and Chaldeans | 7 |
Ancient Greek Astronomy | 13 |
The Reign of Epicycles From Ptolemy | 23 |
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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 |