Rudimentary AstronomyStrahan & Company, 1869 - 172 pages |
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Common terms and phrases
61 Cygni aberration accuracy aphelion apogee appear apse axis body calculated catalogue centre comet correction curve describe determined diameter direction discovery disk earth earth's orbit earth's surface ecliptic effect elements elliptic orbit epoch equal equator equatorial equinox error evection excentricity fixed geocentric gravitation Greenwich heavens Hence Herschel horizon inclination increase inequalities instrument interval Jupiter Kepler's known latitude light line of apsides longitude lunar orbit magnitude mass mean anomaly mean distance measured meridian moon moon's moving mural circle nearly node nutation object observations Observatory Otto Struve parallax perigee perihelion period planet planetary polar distance pole position precession proper motions quantity radius vector reader refraction remarkable revolution right angles right ascensions rotation round the sun Royal Astronomical Society satellites Saturn sidereal sidereal period solar orbit space stars sun's supposed syzygy telescope tion transit true anomaly velocity Venus zenith distances
Popular passages
Page 159 - ... inches of reflecting aperture, up to perfectly separated stars like the milky way, and clustering groups sufficiently insulated and condensed to come under the designation of irregular, and in some cases pretty rich clusters. But besides...
Page 56 - The law of universal gravitation is simply this, that every particle of matter in the universe gravitates towards every other particle, or attracts and is attracted by every other particle, with a force varying inversely as the square of the distance.
Page 49 - Bradley's discoveries of the aberration of light and the nutation of the earth's axis, the photographic measurement of the heavens, Schwabe's work on the sunspot period, and Mr.
Page 3 - To which is added, a description of the Principles and Practice of Isometrical Projection. By JF HEATHER, MA -With 14 Plates.
Page 8 - EMMENS. is. 6d. 152. PRACTICAL HINTS FOR INVESTING MONEY. With an Explanation of the Mode of Transacting Business on the Stock Exchange. By FRANCIS PLAYFORD, Sworn Broker.