History of Astronomy |
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Page ix
... moving platform , the earth , of the directions of a moving object , Mars - to deduce the exact shape of the path of each of these planets , and their actual positions on these paths at any time . Kepler's masterpiece is one of the most ...
... moving platform , the earth , of the directions of a moving object , Mars - to deduce the exact shape of the path of each of these planets , and their actual positions on these paths at any time . Kepler's masterpiece is one of the most ...
Page 11
... move by chance , nor by their own will , but by the determinate will and appointment of the gods . They recorded these move- ments , but mainly in the hope of tracing the will of the gods in mundane affairs . Ptolemy ( about 130 A.D. ) ...
... move by chance , nor by their own will , but by the determinate will and appointment of the gods . They recorded these move- ments , but mainly in the hope of tracing the will of the gods in mundane affairs . Ptolemy ( about 130 A.D. ) ...
Page 18
... moves uniformly , is situated a little distance from the fixed earth . He called this point the excentric . The line from the earth to the excentric " was called the line of apses . A circle having this centre was called the equant ...
... moves uniformly , is situated a little distance from the fixed earth . He called this point the excentric . The line from the earth to the excentric " was called the line of apses . A circle having this centre was called the equant ...
Page 22
... move for a time in a retrograde direction . The attempts of Ptolemy and others of his time to explain the retrograde motion in this way were only approximate . Let us suppose each planet to have a bar with one end centred at the earth ...
... move for a time in a retrograde direction . The attempts of Ptolemy and others of his time to explain the retrograde motion in this way were only approximate . Let us suppose each planet to have a bar with one end centred at the earth ...
Page 26
... move when the earth changes its position - a test which failed com- pletely with the rough means of observation then available . The radical defect of all solar systems previous to the time of Kepler ( 1609 A.D. ) was the slavish ...
... move when the earth changes its position - a test which failed com- pletely with the rough means of observation then available . The radical defect of all solar systems previous to the time of Kepler ( 1609 A.D. ) was the slavish ...
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Common terms and phrases
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