History of Astronomy |
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Page 14
George Forbes. to float upon water . He determined the ratio of the sun's diameter to its orbit , and apparently made out the diameter correctly as half a degree . He left nothing in writing . His successors , Anaximander ( 610-547 B.C. ) ...
George Forbes. to float upon water . He determined the ratio of the sun's diameter to its orbit , and apparently made out the diameter correctly as half a degree . He left nothing in writing . His successors , Anaximander ( 610-547 B.C. ) ...
Page 18
... diameter , correctly , to be half a degree . Eratosthenes ( 276-196 B.C. ) measured the inclination to the equator of the sun's apparent path in the heavens— i.e. , he measured the obliquity of the ecliptic , making it 23 ° 51 ...
... diameter , correctly , to be half a degree . Eratosthenes ( 276-196 B.C. ) measured the inclination to the equator of the sun's apparent path in the heavens— i.e. , he measured the obliquity of the ecliptic , making it 23 ° 51 ...
Page 23
... diameter of the deferent , 1 and its ratio to that of the epicycle , the distance of the excentric3 from the centre of the deferent , and the position of the 2 For definition see p . 22 . 3 For definition see p . 18 . 2 Ibid . I line of ...
... diameter of the deferent , 1 and its ratio to that of the epicycle , the distance of the excentric3 from the centre of the deferent , and the position of the 2 For definition see p . 22 . 3 For definition see p . 18 . 2 Ibid . I line of ...
Page 54
... diameter . But when he first examined this matter he proceeded to use a wrong diameter for the earth , and he found a serious discrepancy . This , for a time , seemed to con- demn his theory , and regretfully he laid that part of his ...
... diameter . But when he first examined this matter he proceeded to use a wrong diameter for the earth , and he found a serious discrepancy . This , for a time , seemed to con- demn his theory , and regretfully he laid that part of his ...
Page 55
... diameter . He then noticed that the consequent bulging of matter at the equator would be attracted by the moon unequally , the nearest parts being most attracted ; and so the moon would tend to tilt the earth when in some parts of her ...
... diameter . He then noticed that the consequent bulging of matter at the equator would be attracted by the moon unequally , the nearest parts being most attracted ; and so the moon would tend to tilt the earth when in some parts of her ...
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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