History of Astronomy |
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Page 34
... rotating bodies . To use the words of Delambre , 2 in drawing attention to the strange conception , he imagined that the earth , revolving round the sun , ought always to show to it the same face ; the contrary phenomena surprised him ...
... rotating bodies . To use the words of Delambre , 2 in drawing attention to the strange conception , he imagined that the earth , revolving round the sun , ought always to show to it the same face ; the contrary phenomena surprised him ...
Page 60
... revolving round it in twenty - seven days ; hills and valleys on the moon ; the planets showing discs of sensible . size , not points like the fixed stars ; Venus show- ing phases according to her position in relation to the sun ...
... revolving round it in twenty - seven days ; hills and valleys on the moon ; the planets showing discs of sensible . size , not points like the fixed stars ; Venus show- ing phases according to her position in relation to the sun ...
Page 64
... round the sun with the planets , and having local whirls revolving with the satellites . As Delambre and Grant have said , this fiction only retarded the progress of pure science . It had no sort of rela- tion to the more modern , but ...
... round the sun with the planets , and having local whirls revolving with the satellites . As Delambre and Grant have said , this fiction only retarded the progress of pure science . It had no sort of rela- tion to the more modern , but ...
Page 73
... revolving round the earth's equator would consequently all regress . And if joined into a solid ring its node would regress ; and it would do so , only more slowly , if encumbered by the spherical part of the earth's mass . There- fore ...
... revolving round the earth's equator would consequently all regress . And if joined into a solid ring its node would regress ; and it would do so , only more slowly , if encumbered by the spherical part of the earth's mass . There- fore ...
Page 146
... rotation in less time by 5 minutes than the red spot a difference of 260 miles an hour . Thus they came together again every ... round it in 11h . 57m . 23s . Between its rising and setting there must be ... revolving 146 History of Astronomy.
... rotation in less time by 5 minutes than the red spot a difference of 260 miles an hour . Thus they came together again every ... round it in 11h . 57m . 23s . Between its rising and setting there must be ... revolving 146 History of Astronomy.
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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.