History of Astronomy |
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Page 19
... attraction . In the year 134 B.C. Hipparchus observed a new star . This upset every notion about the permanence of the fixed stars . He then set to work to catalogue all the principal stars so as to know if any others appeared or ...
... attraction . In the year 134 B.C. Hipparchus observed a new star . This upset every notion about the permanence of the fixed stars . He then set to work to catalogue all the principal stars so as to know if any others appeared or ...
Page 26
... attraction of the sun . To correct for these irregularities Copernicus introduced epicycle on epicycle in the lunar orbit . This is in its main features the system propounded 1 In his great book Copernicus says : " The movement of the ...
... attraction of the sun . To correct for these irregularities Copernicus introduced epicycle on epicycle in the lunar orbit . This is in its main features the system propounded 1 In his great book Copernicus says : " The movement of the ...
Page 44
... attract- ing in such manner that the earth attracts a stone much more than a stone attracts the earth . 3. Bodies are attracted to the earth's centre , not because it is the centre of the universe , but 44 THE DYNAMICAL PERIOD.
... attract- ing in such manner that the earth attracts a stone much more than a stone attracts the earth . 3. Bodies are attracted to the earth's centre , not because it is the centre of the universe , but 44 THE DYNAMICAL PERIOD.
Page 45
... attracted to its centre , but to different points in the neighbourhood of that centre . 5. If the earth and moon ... attraction . Kepler had been appointed Imperial Astronomer with a handsome salary ( on paper ) , a fraction of which ...
... attracted to its centre , but to different points in the neighbourhood of that centre . 5. If the earth and moon ... attraction . Kepler had been appointed Imperial Astronomer with a handsome salary ( on paper ) , a fraction of which ...
Page 52
... attraction for both of them follow the same law as to distance as is given by the planetary motions round the sun ? It has been stated that in this way the first conception of universal gravitation arose.1 Quite the most important event ...
... attraction for both of them follow the same law as to distance as is given by the planetary motions round the sun ? It has been stated that in this way the first conception of universal gravitation arose.1 Quite the most important event ...
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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