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Page 141
... ( Uranus and Neptune being still inde- terminate ) . The general surface of Mars is a deep yellow ; but there are dark grey or greenish patches . Sir John Herschel was the first to attribute the ruddy colour of Mars to its soil rather ...
... ( Uranus and Neptune being still inde- terminate ) . The general surface of Mars is a deep yellow ; but there are dark grey or greenish patches . Sir John Herschel was the first to attribute the ruddy colour of Mars to its soil rather ...
Page 149
... Uranus and Neptune . The splendid dis- coveries of Uranus and two satellites by Sir William Herschel in 1787 , and of Neptune by Adams and Le Verrier in 1846 , have been already described . Lassel added two more satellites to Uranus in ...
... Uranus and Neptune . The splendid dis- coveries of Uranus and two satellites by Sir William Herschel in 1787 , and of Neptune by Adams and Le Verrier in 1846 , have been already described . Lassel added two more satellites to Uranus in ...
Page 150
... Uranus and Neptune are difficult to observe spectroscopically , but appear to have peculiar spectra agreeing together . Sometimes Uranus shows Frauenhofer lines , indicating reflected solar light . But generally these are not seen , and ...
... Uranus and Neptune are difficult to observe spectroscopically , but appear to have peculiar spectra agreeing together . Sometimes Uranus shows Frauenhofer lines , indicating reflected solar light . But generally these are not seen , and ...
Page 155
... Uranus . The physical transformations of comets are among the most wonderful of unexplained phenomena in the heavens . But , for physical astronomers , the greatest interest attaches to the reduction of radius vector of Encke's comet ...
... Uranus . The physical transformations of comets are among the most wonderful of unexplained phenomena in the heavens . But , for physical astronomers , the greatest interest attaches to the reduction of radius vector of Encke's comet ...
Page 161
... Uranus , which led to funds being provided for constructing his 40 - foot telescope , after which , in 1786 , he settled at Slough . In the same way , while trying to detect the annual parallax of the stars , he failed in that quest ...
... Uranus , which led to funds being provided for constructing his 40 - foot telescope , after which , in 1786 , he settled at Slough . In the same way , while trying to detect the annual parallax of the stars , he failed in that quest ...
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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.