History of Astronomy |
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Page 59
... telescopes ever used in astronomy . No sooner had he turned it on the heavenly bodies than he was rewarded by such a shower of startling discoveries as forthwith made his name the best known in Europe . He found curious irregular The ...
... telescopes ever used in astronomy . No sooner had he turned it on the heavenly bodies than he was rewarded by such a shower of startling discoveries as forthwith made his name the best known in Europe . He found curious irregular The ...
Page 62
... telescopes must be now postponed , to avoid discontinuity in the history . of the intellectual development of this period , which lay in the direction of dynamical , or physical , astronomy . Until the time of Kepler no one seems to ...
... telescopes must be now postponed , to avoid discontinuity in the history . of the intellectual development of this period , which lay in the direction of dynamical , or physical , astronomy . Until the time of Kepler no one seems to ...
Page 95
... telescopes in his day , and no pendulum clocks . He recognised the fact that there must be instrumental errors . He made these as small as was possible , meas- ured their amount , and corrected his observa- tions . His table of ...
... telescopes in his day , and no pendulum clocks . He recognised the fact that there must be instrumental errors . He made these as small as was possible , meas- ured their amount , and corrected his observa- tions . His table of ...
Page 97
... telescope as a pointer ; not the Galilean with concave eye - piece , but with a magnifying glass to examine the focal image , at which also a fixed mark could be placed . Kepler was the first to suggest this . Gascoigne was the first to ...
... telescope as a pointer ; not the Galilean with concave eye - piece , but with a magnifying glass to examine the focal image , at which also a fixed mark could be placed . Kepler was the first to suggest this . Gascoigne was the first to ...
Page 98
... telescope was fixed near one end with a counterpoise . The telescope - tube was a double cone , to prevent flexure . Three hori- zontal and three vertical wires were used in the focus . These were illuminated by a speculum , near the ...
... telescope was fixed near one end with a counterpoise . The telescope - tube was a double cone , to prevent flexure . Three hori- zontal and three vertical wires were used in the focus . These were illuminated by a speculum , near the ...
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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.