History of Astronomy |
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... explain how the principal scientific discoveries have been arrived at and the names of the workers to whom such discoveries are due . The books will comprise each about 200 pages . Each volume will contain from 12 to 16 illus- trations ...
... explain how the principal scientific discoveries have been arrived at and the names of the workers to whom such discoveries are due . The books will comprise each about 200 pages . Each volume will contain from 12 to 16 illus- trations ...
Page iv
... arising from the writing of this History , go to explain the invariable hu- mility of the great mathematical astronomers . Newton's comparison of himself to the child on the seashore applies to them all . As each iv Preface.
... arising from the writing of this History , go to explain the invariable hu- mility of the great mathematical astronomers . Newton's comparison of himself to the child on the seashore applies to them all . As each iv Preface.
Page 7
... explain how the sun , having set in the west , could get back to rise in the east without being seen if it was always the It was a great step to suppose the earth to be spherical , and to ascribe the diurnal motions to its rotation ...
... explain how the sun , having set in the west , could get back to rise in the east without being seen if it was always the It was a great step to suppose the earth to be spherical , and to ascribe the diurnal motions to its rotation ...
Page 17
... 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 the sun's diameter to its orbit , and ...
... 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 the sun's diameter to its orbit , and ...
Page 18
... explained the return of the sun to the east each morning by its going under the flat earth in the night . He held that in a solar eclipse the moon hides the sun , and in a lunar eclipse the moon enters the earth's shadow both excellent ...
... explained the return of the sun to the east each morning by its going under the flat earth in the night . He held that in a solar eclipse the moon hides the sun , and in a lunar eclipse the moon enters the earth's shadow both excellent ...
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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.