History of Astronomy |
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Page 11
19), who both found that Mars, Jupiter, Saturn, and Mercury were all between the
eleventh and eighteenth degrees of Pisces, all visible together in the evening on
February 28th, 24.46 B.c., while on the same day the sun and moon were in ...
19), who both found that Mars, Jupiter, Saturn, and Mercury were all between the
eleventh and eighteenth degrees of Pisces, all visible together in the evening on
February 28th, 24.46 B.c., while on the same day the sun and moon were in ...
Page 15
courses of the sun, moon, and of the five planets Mercury, Venus, Mars, Jupiter,
and Saturn. We have records of observations carried on under Asshurbanapal,
who sent astronomers to different parts to study celestial phenomena. Here is
one: ...
courses of the sun, moon, and of the five planets Mercury, Venus, Mars, Jupiter,
and Saturn. We have records of observations carried on under Asshurbanapal,
who sent astronomers to different parts to study celestial phenomena. Here is
one: ...
Page 28
Ptolemy supposed the centres of the epicycles of Mercury and Venus to be on a
bar passing through the sun, and to be between the earth and the sun. The
centres of the epicycles of Mars, Jupiter, and Saturn were supposed to be further
away ...
Ptolemy supposed the centres of the epicycles of Mercury and Venus to be on a
bar passing through the sun, and to be between the earth and the sun. The
centres of the epicycles of Mars, Jupiter, and Saturn were supposed to be further
away ...
Page 32
He noticed that the same supposition, if extended to Mars, Jupiter, and Saturn,
would explain easily why they, and especially Mars, seem so much brighter in
opposition. For Mars would then be a great deal nearer to the earth than at other
...
He noticed that the same supposition, if extended to Mars, Jupiter, and Saturn,
would explain easily why they, and especially Mars, seem so much brighter in
opposition. For Mars would then be a great deal nearer to the earth than at other
...
Page 60
... hills and valleys on the moon; the planets showing discs of sensible size, not
points like the fixed stars; Venus showing phases according to her position in
relation to the sun; Jupiter accompanied by four moons; Saturn with appendages
that ...
... hills and valleys on the moon; the planets showing discs of sensible size, not
points like the fixed stars; Venus showing phases according to her position in
relation to the sun; Jupiter accompanied by four moons; Saturn with appendages
that ...
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Common terms and phrases
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 |