History of Astronomy |
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Page 2
... light and darkness and of heat and cold , as much as to the irregular changes of weather , attacks of disease , and the fortune of war . They soon came to regard the influence of the sun , in connection with light and heat , as a cause ...
... light and darkness and of heat and cold , as much as to the irregular changes of weather , attacks of disease , and the fortune of war . They soon came to regard the influence of the sun , in connection with light and heat , as a cause ...
Page 17
... light from the sun , and that this fact explains her phases ; that an eclipse of the moon happens when the 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 ...
... light from the sun , and that this fact explains her phases ; that an eclipse of the moon happens when the 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 ...
Page 58
... light body and a heavy one fall at the same speed ( except for the resistance of the air ) . Galileo proved this on paper , but to convince the world he had to ex- periment from the leaning tower of Pisa . At an early age he discovered ...
... light body and a heavy one fall at the same speed ( except for the resistance of the air ) . Galileo proved this on paper , but to convince the world he had to ex- periment from the leaning tower of Pisa . At an early age he discovered ...
Page 85
... light . There was an exciting hunt , and on December 31st ( the day before its birthday ) De Zach captured the truant , and Piazzi christened it Ceres . The mean distance from the sun was found to be 2.767 , agreeing with the 2.8 given ...
... light . There was an exciting hunt , and on December 31st ( the day before its birthday ) De Zach captured the truant , and Piazzi christened it Ceres . The mean distance from the sun was found to be 2.767 , agreeing with the 2.8 given ...
Page 98
... light from a lantern placed over the axis , the upper part of the telescope - tube being partly cut away to admit the light . A divided circle , with pointer and reading microscope , was provided for read- ing the declination . He ...
... light from a lantern placed over the axis , the upper part of the telescope - tube being partly cut away to admit the light . A divided circle , with pointer and reading microscope , was provided for read- ing the declination . He ...
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Common terms and phrases
accurate Airy ancient astron Astronomer Royal astronomical units bright calculations Cape catalogue centre century Chaldæans Chinese comet Copernicus diameter discovered discovery earth Egyptian epicycles equatorial error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus History of Astronomy instruments JOHANNES 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 ment Mercury meteor miles a second moon moon's nebulæ Newton observations Observatory orbit parallax period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolving round ring rotation satellites Saturn seems showing Sir William Herschel Sirius solar eclipse solar system spectra spectroscope spectrum sphere spots stellar sun-spot supposed tables telescope theory tion Trans Tycho Brahe universal gravitation Uranus velocity Venus Verrier
Popular passages
Page 67 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Page 26 - So he sate and cunningly guided the craft with the helm, nor did sleep fall upon his eyelids, as he viewed the Pleiads and Bootes, that setteth late, and the Bear, which they likewise call the Wain, which turneth ever in one place, and keepeth watch upon Orion, and alone hath no part, in the baths of Ocean. This star, Calypso, the fair goddess, bade him to keep ever on the left as he traversed the deep.
Page 53 - The third, viz. that the squares of the periodic times are proportional to the cubes of the mean distances...
Page 79 - Wherefore if according to what we have already said it should return again about the year 1758, candid posterity will not refuse to acknowledge that this was first discovered by an Englishman.
Page 122 - ... They have not been regarded as so successful as his geometrical analysis of the observed phenomena. It is only just to add that he himself did not attach equal weight to them ; for in answer to objections urged by Lalande to his theory that the spots are depressions, Wilson wrote thus in 1783 : — ' Whether their first production and subsequent numberless changes depend upon the eructation of elastic vapours from below, or upon eddies or whirlpools commencing at the surface, or upon the dissolving...
Page 51 - He then said boldly that it was impossible that so good an observer as Tycho could be wrong by eight minutes* and added, " out of these eight minutes we will construct a new theory that will explain the motions of all the planets.