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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accepted accurate ancient appear astronomers attraction bodies bright calculations called catalogue cause centre century Chinese circle comet compared complete Copernicus determined diameter direction discovered discovery distance earth eclipse effect elements enabled epicycles equal error explain fact fixed follow force four Galileo gave give given gravitation heavens held Herschel increased interesting Jupiter Kepler knowledge known later LIBRARIES light lunar Mars mass mathematical mean measured method miles moon moon's motion move Newton noticed object observations Observatory opposition orbit original parallax pass period photographic physical planet planetary pole position predicted progress proper motion proved records researches revolve ring rotation round Royal satellites seems seen showed SIGILLUM solar system spectroscope spectrum stars studied sun's supposed surface tables telescope theory tion trace true Tycho Brahe UNIVERSITY VERITAS