## History of Astronomy |

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Page 23

... in his calculations by supposing that the centre, about which the sun moves

uniformly, is situated a little

Chaldaean eclipses, he was able to get an accurate value of the moon's

motion.

... in his calculations by supposing that the centre, about which the sun moves

uniformly, is situated a little

**distance**from the fixed earth. ... Making use ofChaldaean eclipses, he was able to get an accurate value of the moon's

**mean**motion.

Page 51

His analogy between the spaces occupied by the five regular solids and the

distances of the planets from the sun, which filled ... The angle ASP is the

anomaly when the planet is at P. CA or a line drawn from S to D is the

His analogy between the spaces occupied by the five regular solids and the

distances of the planets from the sun, which filled ... The angle ASP is the

anomaly when the planet is at P. CA or a line drawn from S to D is the

**mean****distance**of the ... Page 85

The

glven by Bode's law. Its orbit was found to be inclined over Io° to the ecliptic, and

its diameter was only 161 miles. On March 28th, 1802, Olbers discovered a new ...

The

**mean distance**from the sun was found to be 2.767, agreeing with the 2.8glven by Bode's law. Its orbit was found to be inclined over Io° to the ecliptic, and

its diameter was only 161 miles. On March 28th, 1802, Olbers discovered a new ...

Page 87

derived from observations made before and after opposition, a serious error of

the distance (radius vector) became ... In 1844, assuming a circular orbit, and a

...

derived from observations made before and after opposition, a serious error of

the distance (radius vector) became ... In 1844, assuming a circular orbit, and a

**mean distance**agreeing with Bode's law, he obtained a first approximation to the...

Page 151

The discovery of Eros and the photographic attack upon its path have been

described in their relation to finding the sun's distance. A group of four asteroids

has lately been found, with a

The discovery of Eros and the photographic attack upon its path have been

described in their relation to finding the sun's distance. A group of four asteroids

has lately been found, with a

**mean distance**and period equal to that of Jupiter.### What people are saying - Write a review

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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.