Handbook of AstronomyWalton and Maberly, 1860 - 496 pages |
Contents
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Common terms and phrases
altitude angular aphelion apparent diameter apparent magnitude apparent motion ascertained astronomical atmosphere attraction axis bodies called celestial equator celestial sphere centre circle comet conjunction consequently degree density determined direction discovered discovery disk disturbing diurnal diurnal motion earth ecliptic edge effect equal equinoxial points excentricity explained firmament fixed globe greater heavens hemisphere Herschel horizon increase inferior conjunction inferior planet instrument interval Jupiter latitude less light line of collimation longitude lunar mass matter mean distance measured meridian millions of miles moon moon's move nearly night nodes object observatory observed opposition orbit parallax passes the meridian perihelion period phenomena planet pole prime vertical produced ratio revolution revolve right angles right ascension ring rotation round the sun satellites Saturn seen semi-diameters solar system sphere spots stars sun's superior conjunction supposed surface synodic period telescope terrestrial tion transit Uranus velocity vertical visible visual wires zenith
Popular passages
Page 476 - On it place a globe, two feet in diameter; this will represent the Sun; Mercury will be represented by a grain of mustard seed, on the circumference of a circle 164 feet in diameter for its orbit; Venus a pea, on a circle 284 feet in diameter; the Earth also a pea, on a circle of 430 feet; Mars a rather large pin's head, on a circle of 654 feet...
Page 441 - THE LARGEST CLUSTER OF STARS. Among the illustrations to Sir John Herschel's work is the noble globular cluster, Centaur ; beyond all comparison the richest and largest object of the kind in the heavens.
Page 476 - ... rather large pin's head, on a circle of 654 feet ; Juno, Ceres, Vesta, and Pallas, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across ; Saturn a small orange, on a circle of four-fifths of a mile ; and Uranus a full-sized cherry, or small plum, upon the circumference of a circle more than a mile and a half in diameter.
Page 149 - Vesuvius and elsewhere ; but with the remarkable peculiarity that the bottoms of many of the craters are very deeply depressed below the general surface of the moon, the internal depth being in many cases two or three times the external height.
Page 349 - When it is considered that the period of Halley's comet is about seventyfive years, and that every portion of its course, for two successive periods, was necessary to be calculated separately in this way, some notion may be formed of the labour encountered by Lalande and Madame Lepaute.
Page 98 - ... one from north to south, and the other from east to west. The...
Page 322 - shows us the things which will be hereafter," not obscurely shadowed out in figures and in parables, as must necessarily be the case with other revelations, but attended with the most minute precision of time, place, and circumstance. He converts the hours as they roll into an ever-present miracle, in attestation of those laws which his Creator...