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Airy ancient Astronomer Royal astronomical units attraction bright calculations Cape catalogue centre century Chinese circular comet compute 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 instruments Johannes Kepler John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance mean motion measured ment Mercury meteor miles a second moon moon's nebulae Newton Observatory orbit parallax period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor researches retrograde retrograde motion revolution revolving round ring rotation satellites Saturn seems seen 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 Uranus velocity Venus Verrier zenith
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 201 - HALF-HOURS WITH THE STARS : a Plain and Easy Guide to the Knowledge of the Constellations. Showing in 12 Maps the position of the principal Star-Groups night after night throughout the year. With Introduction and a separate Explanation of each Map. True for every Year.
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 204 - The Basis of Social Relations. A Study in Ethnic Psychology. By DANIEL G. BRINTON, AM, MD, LL.D., Sc.D., Late Professor of American Archaeology and Linguistics in the University of Pennsylvania ; Author of " History of Primitive Religions," " Races and Peoples," " The American Race,
Page 201 - Easy Guide to the Knowledge of the Constellations, showing in 12 Maps, the Position of the Principal Star-Groups Night after Night throughout the Year, with introduction and a separate explanation of each Map. True for every Year.
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 203 - ... volume contains from twelve to sixteen carefully-prepared illustrations, including portraits of celebrated discoverers, many from originals not hitherto reproduced, and explanatory views and diagrams. The series as planned should cover in outline the whole sphere of human knowledge. ^ Science is to be viewed as a product of human endeavor and mental discipline, rather than taken in its purely objective reference to facts. The essential purpose has been to present as far as practicable the historical...