History of Astronomy |
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Page 83
... heliometer , which is not used at Greenwich . This serves the purpose of a double image micrometer , and is made by dividing the object - glass of a telescope along a diameter . Each half is mounted so as to slide a distance of several ...
... heliometer , which is not used at Greenwich . This serves the purpose of a double image micrometer , and is made by dividing the object - glass of a telescope along a diameter . Each half is mounted so as to slide a distance of several ...
Page 84
... helio- meter at the Island of Ascension to measure the parallax of Mars in opposition , and found the sun's distance 93,080,000 miles . He considered that , while the superiority of the heliometer had been proved , the results would be ...
... helio- meter at the Island of Ascension to measure the parallax of Mars in opposition , and found the sun's distance 93,080,000 miles . He considered that , while the superiority of the heliometer had been proved , the results would be ...
Page 85
... heliometers . His final result was 92,870,000 miles , the parallax being 8 ′′ , 802 ( Cape Obs . , Vol . VI . ) . So delicate were these measures that Gill detected a minute periodic error of theory of twenty - seven days , owing to a ...
... heliometers . His final result was 92,870,000 miles , the parallax being 8 ′′ , 802 ( Cape Obs . , Vol . VI . ) . So delicate were these measures that Gill detected a minute periodic error of theory of twenty - seven days , owing to a ...
Page 141
... heliometer and the camera cannot otherwise be made absolute . The number of stars down to the fourteenth magni- tude may be taken at about 30,000,000 ; and that of all the stars visible in the greatest modern telescopes is probably ...
... heliometer and the camera cannot otherwise be made absolute . The number of stars down to the fourteenth magni- tude may be taken at about 30,000,000 ; and that of all the stars visible in the greatest modern telescopes is probably ...
Page 148
... Heliometer , 83 Heller , 120 Helmholtz , H. L. F. , 35 Henderson , T. , 128 Henry , P. and P. , 139 , 140 , 143 Heraclides , 16 Heraclitus , 14 Herodotus , 13 Herschel , W. , 65 , 68 , 97 , 107 , 110 , 114 , 115 , 116 , 117 , 118 , 126 ...
... Heliometer , 83 Heller , 120 Helmholtz , H. L. F. , 35 Henderson , T. , 128 Henry , P. and P. , 139 , 140 , 143 Heraclides , 16 Heraclitus , 14 Herodotus , 13 Herschel , W. , 65 , 68 , 97 , 107 , 110 , 114 , 115 , 116 , 117 , 118 , 126 ...
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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