History of Astronomy |
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Page 80
... mathematical astronomer . Clairaut , assisted by Lalande , found that Sat- urn would retard the comet 100 days , Jupiter 518 days , and predicted its return to perihelion on April 13th , 1759. In his communication to the French Academy ...
... mathematical astronomer . Clairaut , assisted by Lalande , found that Sat- urn would retard the comet 100 days , Jupiter 518 days , and predicted its return to perihelion on April 13th , 1759. In his communication to the French Academy ...
Page 81
... mathematical astronomers , and to inspire a reverence for the names connected with these researches , which for two hundred years have been establishing the universality of Newton's law . The lunar and planetary theories , the beautiful ...
... mathematical astronomers , and to inspire a reverence for the names connected with these researches , which for two hundred years have been establishing the universality of Newton's law . The lunar and planetary theories , the beautiful ...
Page 92
... observa- tions . It is the pride of astronomers that their science stands above all others in the accuracy of the facts observed , as well as in the rigid logic of the mathematics used for interpreting these facts . It 92 X.
... observa- tions . It is the pride of astronomers that their science stands above all others in the accuracy of the facts observed , as well as in the rigid logic of the mathematics used for interpreting these facts . It 92 X.
Page 93
George Forbes. of the mathematics used for interpreting these facts . It is interesting to trace historically the inven- tion of those instruments of precision which have led to this result , and , without entering on the details ...
George Forbes. of the mathematics used for interpreting these facts . It is interesting to trace historically the inven- tion of those instruments of precision which have led to this result , and , without entering on the details ...
Page 110
... mathematics defective through want of use ? James Gregory's nephew David had a heap of MS . notes by Newton . These descended to a Miss Gregory , of Edinburgh , who handed them to the present writer , when an undergraduate at Cambridge ...
... mathematics defective through want of use ? James Gregory's nephew David had a heap of MS . notes by Newton . These descended to a Miss Gregory , of Edinburgh , who handed them to the present writer , when an undergraduate at Cambridge ...
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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.