Popular Astronomy...Harper, 1880 - 571 pages |
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Common terms and phrases
angle apparent motions appear astronomers atmosphere attraction axis cause celestial equator celestial sphere centre century chromosphere circle comet Copernican system Copernicus dark described determined diameter direction disk distance diurnal motion earth entirely epicycle equator equinox eye-piece focus force glass gravitation heat heavenly bodies heavens hemisphere Herschel Hipparchus horizon inches instrument Jupiter Kepler known latitude latter length light longitude lunar magnifying power Mars mass mean measuring Mercury meridian method miles minutes mirror moon moon's move nearly node object observations Observatory orbit parallax pass perihelion photosphere planet planetary pole position prism Ptolemaic system Ptolemy rays reflected reflecting telescope reflector refraction result revolution revolving right ascension rotation round satellites Saturn seen side sidereal solar spectrum spots star sun and moon sun's supposed surface telescope temperature theory tion total eclipse transit transit of Venus Uranus vapors velocity Venus visible zenith