History of Astronomy |
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Page 103
Lockyer also detected displacements of the spectrum lines in the spots, such as
would be produced by a rapid motion in the line of sight. It has been found that
both uprushes and downrushes occur, but there is no marked predominance of ...
Lockyer also detected displacements of the spectrum lines in the spots, such as
would be produced by a rapid motion in the line of sight. It has been found that
both uprushes and downrushes occur, but there is no marked predominance of ...
Page 129
motions and parallaxes combined tell us the velocity of the motion of these stars
across the line of sight : a Centauri 14.4 miles a second=4.2 astronomical units a
year; 61 Cygni 37.9 miles a second=i 1.2 astronomical units a year.
motions and parallaxes combined tell us the velocity of the motion of these stars
across the line of sight : a Centauri 14.4 miles a second=4.2 astronomical units a
year; 61 Cygni 37.9 miles a second=i 1.2 astronomical units a year.
Page 130
The spectroscope has shown that these have also often the same velocity in the
line of sight. Thus in the Great Bear, y, 8, t, f, all agree as to angular proper motion
. 8 was too faint for a spectroscopic measurement, but all the others have been ...
The spectroscope has shown that these have also often the same velocity in the
line of sight. Thus in the Great Bear, y, 8, t, f, all agree as to angular proper motion
. 8 was too faint for a spectroscopic measurement, but all the others have been ...
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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