History of Astronomy |
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Page 37
There was nothing so startlingly simple in his system as to lead the cautious
astronomer to accept it, as there was in the later Keplerian system; and the
absence of parallax in the stars seemed to condemn his system, which had no
physical ...
There was nothing so startlingly simple in his system as to lead the cautious
astronomer to accept it, as there was in the later Keplerian system; and the
absence of parallax in the stars seemed to condemn his system, which had no
physical ...
Page 45
He made accurate observations of its distance from the nine principal stars in
Cassiopeia, and proved that it had no measurable parallax. Later he employed
the same method with the comets of 1577, 1580, 1582, 1585, 1590, 1593, and
1596, ...
He made accurate observations of its distance from the nine principal stars in
Cassiopeia, and proved that it had no measurable parallax. Later he employed
the same method with the comets of 1577, 1580, 1582, 1585, 1590, 1593, and
1596, ...
Page 47
He did not accept the Copernican theory that the earth moves, but for a working
hypothesis he used a modification of an old Egyptian theory, mathematically
identical with that of Copernicus, but not involving a stellar parallax. He says (De
...
He did not accept the Copernican theory that the earth moves, but for a working
hypothesis he used a modification of an old Egyptian theory, mathematically
identical with that of Copernicus, but not involving a stellar parallax. He says (De
...
Page 100
For these reasons Bradley had set up this instrument at Kew, to attempt the proof
of the earth's motion by observing the annual parallax of stars. He certainly found
an annual variation of zenith distance, but not at the times of year required by ...
For these reasons Bradley had set up this instrument at Kew, to attempt the proof
of the earth's motion by observing the annual parallax of stars. He certainly found
an annual variation of zenith distance, but not at the times of year required by ...
Page 106
But in the hands of Sir David Gill (late His Majesty's Astronomer at the Cape of
Good Hope), and especially in his great researches on Solar and on Stellar
parallax, it has been recognised as an instrument of the very highest accuracy, ...
But in the hands of Sir David Gill (late His Majesty's Astronomer at the Cape of
Good Hope), and especially in his great researches on Solar and on Stellar
parallax, it has been recognised as an instrument of the very highest accuracy, ...
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accurate Airy ancient Astronomer Royal astronomical units bright calculations Cape catalogue centre century Chaldaeans 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 Huggins instruments JOHANNEs KEPLER John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance measured ment Mercury meteor miles a second moon nebulae Newton º º 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.
Bibliographic information
| Title | History of Astronomy Hist. of sci. series History of the sciences |
| Author | George Forbes |
| Publisher | Putnam, 1909 |
| Original from | the University of California |
| Digitized | 29 Nov 2007 |
| Length | 200 pages |
| Export Citation | BiBTeX EndNote RefMan |