History of Astronomy |
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Page 100
... proper motion ; but , so far as it went , this was a beautiful confirmation of Wilson's discovery . Howlett , how- ever , in 1894 , after thirty years of work , showed that the spots are not always depressions , being very subject to ...
... proper motion ; but , so far as it went , this was a beautiful confirmation of Wilson's discovery . Howlett , how- ever , in 1894 , after thirty years of work , showed that the spots are not always depressions , being very subject to ...
Page 119
... motion ; but the asteroids , by their proper motion , appear as short lines . The discovery of Eros and the photographic attack upon its path have been described in their relation to finding the sun's distance . A group of four ...
... motion ; but the asteroids , by their proper motion , appear as short lines . The discovery of Eros and the photographic attack upon its path have been described in their relation to finding the sun's distance . A group of four ...
Page 128
... proper motion had been found to be large , as this argued proximity . Henderson , at the Cape of Good Hope , observed a Centauri , whose annual proper motion he found to amount to 3 ′′ .6 , in 1832-3 ; and a few years later deduced its ...
... proper motion had been found to be large , as this argued proximity . Henderson , at the Cape of Good Hope , observed a Centauri , whose annual proper motion he found to amount to 3 ′′ .6 , in 1832-3 ; and a few years later deduced its ...
Page 129
... Proper Motion . - In 1718 Halley2 detected the proper motions of Arcturus and Sirius . In 1738 J. Cassini 3 showed that the former had moved five minutes of arc since Tycho Brahe fixed its position . In 1792 Piazzi noted the motion of ...
... Proper Motion . - In 1718 Halley2 detected the proper motions of Arcturus and Sirius . In 1738 J. Cassini 3 showed that the former had moved five minutes of arc since Tycho Brahe fixed its position . In 1792 Piazzi noted the motion of ...
Page 130
... proper motion , and line of sight motion , in the case of Pleiades and other groups . Maskelyne measured many proper motions of stars , from which W. Herschel ' came to the conclusion that these apparent motions are for the most part due to ...
... proper motion , and line of sight motion , in the case of Pleiades and other groups . Maskelyne measured many proper motions of stars , from which W. Herschel ' came to the conclusion that these apparent motions are for the most part due to ...
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Common terms and phrases
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