## History of Astronomy |

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Page i

Further volumes are in plan on the following subjects:

Mechanics. Molecular Physics, Heat, Life, and Electricity. Human Physiology,

Embryology, and Heredity. Acoustics, Harmonics, and the Physiology of Hearing,

together ...

Further volumes are in plan on the following subjects:

**Mathematics**andMechanics. Molecular Physics, Heat, Life, and Electricity. Human Physiology,

Embryology, and Heredity. Acoustics, Harmonics, and the Physiology of Hearing,

together ...

Page iv

Then, again, new points of view are provided by the invention of new methods in

that system of logic which we call

assure us that a statement A is equivalent to statements B, C, D, or is one of the ...

Then, again, new points of view are provided by the invention of new methods in

that system of logic which we call

**mathematics**. All that**mathematics**can do is toassure us that a statement A is equivalent to statements B, C, D, or is one of the ...

Page 20

It is now generally accepted that the real existence of these spheres was not

suggested, but the idea was only a

construction of tables for predicting the places of the heavenly bodies. Aristotle (

384–322 ...

It is now generally accepted that the real existence of these spheres was not

suggested, but the idea was only a

**mathematical**conception to facilitate theconstruction of tables for predicting the places of the heavenly bodies. Aristotle (

384–322 ...

Page 37

satisfied with this explanation must be contented by being told that “

are for

he expresses his conviction over and over again that the earth is in motion.

satisfied with this explanation must be contented by being told that “

**mathematics**are for

**mathematicians**” (Mathematicis mathematica scribuntur). At the same timehe expresses his conviction over and over again that the earth is in motion.

Page 39

Both were introduced only to illustrate the

the solar, planetary, and lunar tables were constructed. The epicycles

represented nothing more nor less than the first terms in the Fourier series, which

in the last ...

Both were introduced only to illustrate the

**mathematical**conception upon whichthe solar, planetary, and lunar tables were constructed. The epicycles

represented nothing more nor less than the first terms in the Fourier series, which

in the last ...

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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.