History of Astronomy |
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Page 87
... refractors , chromatic aberra- tion , remained insurmountable until John Dollond ( born ' 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 ' 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 11th 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 11th 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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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