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 , and its ratio to that of the epicycle , the distance of the excentric3 from the centre of the deferent , and the position of the For definition see p . 22 . 3 For definition see p . 18 . 2 Ibid . C line of ...
... diameter of the deferent , and its ratio to that of the epicycle , the distance of the excentric3 from the centre of the deferent , and the position of the For definition see p . 22 . 3 For definition see p . 18 . 2 Ibid . C 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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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 nebulæ 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