## History of Astronomy |

### From inside the book

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Page 12

If this account be true, it means that in the twentysecond century B.c. some rule

for

lead to the detection of the eighteen-year cycle known to the Chaldaeans as the ...

If this account be true, it means that in the twentysecond century B.c. some rule

for

**calculating**eclipses was in use. Here, again, patient observation would easilylead to the detection of the eighteen-year cycle known to the Chaldaeans as the ...

Page 23

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

allowed for this in his

sun moves uniformly, is situated a little distance from the fixed earth. He called

this ...

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, about which thesun moves uniformly, is situated a little distance from the fixed earth. He called

this ...

Page 31

... dynamical basis. His great object was to increase the accuracy of the

... dynamical basis. His great object was to increase the accuracy of the

**calculations**and the tables. The results of The Geometrical Period 3I. Page 32

accuracy of the

printed just before his death in an interesting book, De Revolutionibus Orbium

Celestium. It is only by careful reading of this book that the true position of ...

accuracy of the

**calculations**and the tables. The results of his cogitations wereprinted just before his death in an interesting book, De Revolutionibus Orbium

Celestium. It is only by careful reading of this book that the true position of ...

Page 39

The epicycles represented nothing more nor less than the first terms in the

Fourier series, which in the last century has become a basis of such

both in astronomy and physics generally. Book II The Dynamical Period 5.

Discovery ...

The epicycles represented nothing more nor less than the first terms in the

Fourier series, which in the last century has become a basis of such

**calculations**,both in astronomy and physics generally. Book II The Dynamical Period 5.

Discovery ...

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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.