An Elementary Astronomy for Academies and Schools: Illustrated by Numerous Original Diagrams and Adapted to Use Either with Or Without the Author's Large MapsHuntington and Savage, 1849 - 243 pages |
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Common terms and phrases
angular aphelion appear apsides ascending node Asteroids astronomers atmosphere attraction axis bright stars called Capricornus celestial centre Ceres circle clusters color Coma Berenices comets conjunction constellation degrees diameter direction disc distance double star earth ecliptic equator equinoctial equinox figure fixed stars globe head heavens inferior conjunction interior planet Jupiter known largest star learner Lesson longitude lunar Mars Mercury miles moon moon's orbit motion naked eye nearly nebulæ observed Olmsted opposite Pallas pass perihelion planetary planets poles primary planets principal stars Prof remarkable represented respecting RETROGRADE MOTIONS revolve right ascension rings satellites Saturn second magnitude seen shadow side sidereal Sirius small stars solar bodies solar spots Solar System Southern sphere spring tides sun and moon sun's supposed surface Taurus telescope theory third magnitude tide-wave tion velocity Venus Verrier Vesta visible west to east Zodiacal Light zone
Popular passages
Page 163 - He telleth the number of the stars, and calleth them all by their names.
Page 166 - Canst thou bind the sweet influences of Pleiades, or loose the bands of Orion? Canst thou bring forth Mazzaroth in his season? or canst thou guide Arcturus with his sons?
Page 216 - The PRIME VERTICAL is that azimuth circle which passes through the east and west points of the horizon, and is always at right angles...
Page 189 - This remarkable law of variation certainly appears strongly to suggest the revolution round it of some opaque body, which, when interposed between us and Algol, cuts off a large...
Page 208 - Day, (astronomical,) the time between two successive transits of the sun's centre over the same meridian, which always begins and ends at noon.
Page 91 - We see it as Columbus saw America from the shores of Spain. Its movements have been felt, trembling along the far-reaching line of our analysis, with a certainty hardly inferior to that of ocular demonstration.
Page 192 - As to those stars which suddenly shine forth with a very vivid light, and then immediately disappear, it is extremely probable that great conflagrations, produced by extraordinary causes, take place on their surface. This conjecture is confirmed by their change of colour, which is analogous to that presented to us on the earth by those bodies which are set on fire and then gradually extinguished.
Page 200 - It is small, and particularly well defined, so as in fact to have much more the appearance of a flat oval solid ring than of a nebula. The axes of the ellipse are to each other in the proportion of about 4 to 5, and the opening occupies about half...
Page 200 - They have, as their name imports, exactly the appearance of planets : round or slightly oval discs, in some instances quite sharply terminated, in others a little hazy at the borders, and of a light exactly equable or only a very little mottled, which, in some of them, approaches in vividness to that of actual planets.
Page 153 - Sun in one of the foci, its rate of motion will be unequal in different parts of its orbit — swiftest at perihelion, and slowest at aphelion. From perihelion to aphelion the centripetal more directly counteracts the centrifugal force, and the planet is retarded. On the other hand, from the aphelion to the perihelion point, the centripetal and centrifugal forces are united, or act in a similar direction.