## History of Astronomy |

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Page 23

He measured the equation of time and the irregular motion of the sun; and

allowed for this in his calculations by supposing that the centre, ... Making use of

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

He measured the equation of time and the irregular motion of the sun; and

allowed for this in his calculations by supposing that the centre, ... Making use of

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

**mean****motion**. Page 63

He discovered the errors in Jupiter's calculated place, due to what we now know

as the long inequality of Jupiter and Saturn, and measured with considerable

accuracy the acceleration at that date of Jupiter's

...

He discovered the errors in Jupiter's calculated place, due to what we now know

as the long inequality of Jupiter and Saturn, and measured with considerable

accuracy the acceleration at that date of Jupiter's

**mean motion**, and indicated the...

Page 72

o w wo o r of

3.4. O

variation ”.. 36. Io 35.47 Annual equation . . . . . . . . - - - - II.5 I II. I.4 Inequality of

o w wo o r of

**Mean**monthly**motion**of Apses. . . . . . . . *- - - - - - - - - - - - - 1.3.1.283.4. O

**Mean**annual**motion**of nodes 19. 18. 1,23 19.2 1.22,50**Mean**value of “variation ”.. 36. Io 35.47 Annual equation . . . . . . . . - - - - II.5 I II. I.4 Inequality of

**mean**... Page 76

He was the first to detect the acceleration of the moon's

, having compared his own observations with those of more ancient astronomers,

supplied an accurate value of the moon's

He was the first to detect the acceleration of the moon's

**mean motion**. Hipparchus, having compared his own observations with those of more ancient astronomers,

supplied an accurate value of the moon's

**mean motion**in his time. Page 77

Thus the solar influence has been diminishing, and the moon's

increased. Laplace computed the amount at Io" in one century, agreeing with

observation. (Later on Adams showed that Laplace's calculation was wrong, and

that ...

Thus the solar influence has been diminishing, and the moon's

**mean motion**increased. Laplace computed the amount at Io" in one century, agreeing with

observation. (Later on Adams showed that Laplace's calculation was wrong, and

that ...

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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.