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Page 78
... miles per second . 1681 he took up his duties as astronomer at Copenhagen , and built the first transit circle on a window - sill of his house . The iron axis was five feet long and one and a - half inches thick , and the telescope was ...
... miles per second . 1681 he took up his duties as astronomer at Copenhagen , and built the first transit circle on a window - sill of his house . The iron axis was five feet long and one and a - half inches thick , and the telescope was ...
Page 84
... another star , and then to do the same by a displacement in the opposite direction ... second of arc . The superiority of the heliometer over all other devices ... miles . He considered that , while the superiority of the heliometer had ...
... another star , and then to do the same by a displacement in the opposite direction ... second of arc . The superiority of the heliometer over all other devices ... miles . He considered that , while the superiority of the heliometer had ...
Page 85
... miles a second ; whence the distance to the sun is 92,780,000 miles . There seems , however , to be some uncertainty about the true value of the aberration , any determination of which is subject to irregularities due to the " seasonal ...
... miles a second ; whence the distance to the sun is 92,780,000 miles . There seems , however , to be some uncertainty about the true value of the aberration , any determination of which is subject to irregularities due to the " seasonal ...
Page 92
... miles per second . In 1868 Huggins2 succeeded in thus measuring the velocities of stars in the direction of the line of sight . In 1873 Vogel3 compared the spectra of the sun's East ( approaching ) limb and West ( receding ) limb , and ...
... miles per second . In 1868 Huggins2 succeeded in thus measuring the velocities of stars in the direction of the line of sight . In 1873 Vogel3 compared the spectra of the sun's East ( approaching ) limb and West ( receding ) limb , and ...
Page 103
... miles a second . But it must be remembered that pressure of a gas has some effect in displacing the spectral lines . So we must go on , collecting data , until a time comes when the meaning of all the facts can be made clear . Total ...
... miles a second . But it must be remembered that pressure of a gas has some effect in displacing the spectral lines . So we must go on , collecting data , until a time comes when the meaning of all the facts can be made clear . Total ...
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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