History of Astronomy |
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Page ix
... 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 interesting books ...
... 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 interesting books ...
Page 5
... earth's equator to the plane of her orbit ( the obliquity of the ecliptic ) has been diminishing slowly since prehistoric times ; and this fact has been confirmed by Egyptian and Chinese observations on the length of the shadow of a ...
... earth's equator to the plane of her orbit ( the obliquity of the ecliptic ) has been diminishing slowly since prehistoric times ; and this fact has been confirmed by Egyptian and Chinese observations on the length of the shadow of a ...
Page 6
... earth to be spherical , and to ascribe the diurnal motions to its rotation . Probably the greatest step ever made in astronomical theory was the placing of the sun , moon , and planets at different distances from the earth instead of ...
... earth to be spherical , and to ascribe the diurnal motions to its rotation . Probably the greatest step ever made in astronomical theory was the placing of the sun , moon , and planets at different distances from the earth instead of ...
Page 13
... earth cuts off the sun's light from her . He supposed the earth to be flat , and to float upon water . He determined the ratio of THE GEOMETRICAL PERIOD 13 THE MOON AND PLANETS PAGE.
... earth cuts off the sun's light from her . He supposed the earth to be flat , and to float upon water . He determined the ratio of THE GEOMETRICAL PERIOD 13 THE MOON AND PLANETS PAGE.
Page 14
... earth to be a sphere . Pythagoras ( 569-470 B.C. ) visited Egypt to study science . He deduced his system , in which the earth revolves in an orbit , from fantastic first principles , of which the following are examples : " The circular ...
... earth to be a sphere . Pythagoras ( 569-470 B.C. ) visited Egypt to study science . He deduced his system , in which the earth revolves in an orbit , from fantastic first principles , of which the following are examples : " The circular ...
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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