History of Astronomy |
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Page 111
Newton's trouble with refractors, chromatic aberration, remained insurmountable
until John Dollond (born 1706, died 1761), after many experiments, found out
how to make an achromatic lens out of two lenses — one of crown glass, the
other ...
Newton's trouble with refractors, chromatic aberration, remained insurmountable
until John Dollond (born 1706, died 1761), after many experiments, found out
how to make an achromatic lens out of two lenses — one of crown glass, the
other ...
Page 112
Passing now from these large reflectors to refractors, further improvements have
been made in the manufacture of glass by Chance, of Birmingham, Feil and
Mantois, of Paris, and Schott, of Jena; while specialists in grinding lenses, like
Alvan ...
Passing now from these large reflectors to refractors, further improvements have
been made in the manufacture of glass by Chance, of Birmingham, Feil and
Mantois, of Paris, and Schott, of Jena; while specialists in grinding lenses, like
Alvan ...
Page 113
At Greenwich there is the 28-inch photographic refractor, and the Thompson
equatorial by Grubb, carrying both the 26-inch photographic refractor and the 30-
inch reflector. At the Cape of Good Hope we find Mr. Frank McClean's 24-inch ...
At Greenwich there is the 28-inch photographic refractor, and the Thompson
equatorial by Grubb, carrying both the 26-inch photographic refractor and the 30-
inch reflector. At the Cape of Good Hope we find Mr. Frank McClean's 24-inch ...
Page 142
The Washington Observatory had acquired the fine 26-inch refractor, and Asaph
Hall searched for satellites, concealing the planet's disc to avoid the glare. On
August 11th he had a suspicion of a satellite. This was confirmed on the 16th,
and ...
The Washington Observatory had acquired the fine 26-inch refractor, and Asaph
Hall searched for satellites, concealing the planet's disc to avoid the glare. On
August 11th he had a suspicion of a satellite. This was confirmed on the 16th,
and ...
Page 146
Galileo's great discovery of Jupiter's four moons was the last word in this
connection until September 9th, 1892, when Barnard, using the 36-inch refractor
of the Lick Observatory, detected a tiny spot of light closely following the planet.
Galileo's great discovery of Jupiter's four moons was the last word in this
connection until September 9th, 1892, when Barnard, using the 36-inch refractor
of the Lick Observatory, detected a tiny spot of light closely following the planet.
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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 |