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 149
... heliometer ) , etc. 99.66 E. W. Maunder , The Royal Observatory , Greenwich . London , 1900 . Chauvenet , Manual of Spherical and Practical Astronomy . 1893 . VII . GENERAL ASTRONOMY . C. A. Young , A Text - Book of General Astronomy ...
... heliometer ) , etc. 99.66 E. W. Maunder , The Royal Observatory , Greenwich . London , 1900 . Chauvenet , Manual of Spherical and Practical Astronomy . 1893 . VII . GENERAL ASTRONOMY . C. A. Young , A Text - Book of General Astronomy ...
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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 nebulę 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