History of Astronomy |
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Page 87
... refractors , chromatic aberra- tion , remained insurmountable until John Dollond ( born I Will the indulgent reader excuse an anecdote which may encourage some workers who may have found their mathematics defective through want of use ...
... refractors , chromatic aberra- tion , remained insurmountable until John Dollond ( born I Will the indulgent reader excuse an anecdote which may encourage some workers who may have found their mathematics defective through want of use ...
Page 88
... refractor of 9.9 inches diameter and 13.5 feet focal length , and another , of 12 inches diameter and 18 feet focal ... refractors , further improvements have been made in the manu- facture of glass by Chance , of Birmingham , Feil and ...
... refractor of 9.9 inches diameter and 13.5 feet focal length , and another , of 12 inches diameter and 18 feet focal ... refractors , further improvements have been made in the manu- facture of glass by Chance , of Birmingham , Feil and ...
Page 89
... refractor , for Chicago . At Greenwich there is the 28 - inch photographic refractor , and the Thompson equatoreal by Grubb , carrying both the 26 - inch photographic refractor and the 30 - inch reflector . At the Cape of Good Hope we ...
... refractor , for Chicago . At Greenwich there is the 28 - inch photographic refractor , and the Thompson equatoreal by Grubb , carrying both the 26 - inch photographic refractor and the 30 - inch reflector . At the Cape of Good Hope we ...
Page 112
... refractor , and Asaph Hall searched for satellites , con- cealing the planet's disc to avoid the glare . On August IIth he had a suspicion of a satellite . This was con- firmed on the 16th , and on the following night a second one was ...
... refractor , and Asaph Hall searched for satellites , con- cealing the planet's disc to avoid the glare . On August IIth he had a suspicion of a satellite . This was con- firmed on the 16th , and on the following night a second one was ...
Page 115
... refractor of the Lick Observatory , detected a tiny spot of light closely following the planet . This proved to be a new satellite ( fifth ) , nearer to the planet than any other , and revolv- ing round it in 11h . 57m . 23s . Between ...
... refractor of the Lick Observatory , detected a tiny spot of light closely following the planet . This proved to be a new satellite ( fifth ) , nearer to the planet than any other , and revolv- ing round it in 11h . 57m . 23s . Between ...
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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 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