History of Astronomy |
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Page 128
... or 63,072 astronomical units ; I astronomical unit a year = 2.94 miles a second ; and the earth's orbital velocity = 18.5 miles a second . motions and parallaxes combined tell us the velocity of the 128 THE PHYSICAL PERIOD.
... or 63,072 astronomical units ; I astronomical unit a year = 2.94 miles a second ; and the earth's orbital velocity = 18.5 miles a second . motions and parallaxes combined tell us the velocity of the 128 THE PHYSICAL PERIOD.
Page 129
... astronomical units a year ; 61 Cygni 37.9 miles a second = 11.2 astronomical units a year . These successes led to renewed zeal , and now the distances of many stars are known more or less accurately . Several of the brightest stars ...
... astronomical units a year ; 61 Cygni 37.9 miles a second = 11.2 astronomical units a year . These successes led to renewed zeal , and now the distances of many stars are known more or less accurately . Several of the brightest stars ...
Page 130
... astronomical units a year . The work of Herschel in this matter has been checked by comparing spectroscopic velocities in the line of sight which , so far as the sun's motion is concerned , would give a maximum rate of approach for 1 ...
... astronomical units a year . The work of Herschel in this matter has been checked by comparing spectroscopic velocities in the line of sight which , so far as the sun's motion is concerned , would give a maximum rate of approach for 1 ...
Page 131
... astronomical units a year . The average proper motion of a first magnitude star has been found to be o " .25 annually , and of a sixth magnitude star o " .04 . But that all bright stars are nearer than all small stars , or that they ...
... astronomical units a year . The average proper motion of a first magnitude star has been found to be o " .25 annually , and of a sixth magnitude star o " .04 . But that all bright stars are nearer than all small stars , or that they ...
Page 132
... astronomical units . On examining these stereoscopically , some of the stars rise out of the general plane of the stars , and seem to be much nearer . Many of the stars are thus seen to be sus- pended in space at different distances ...
... astronomical units . On examining these stereoscopically , some of the stars rise out of the general plane of the stars , and seem to be much nearer . Many of the stars are thus seen to be sus- pended in space at different distances ...
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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