An Introduction to Astronomy: Designed as a Text Book for the Students of Yale CollegeR.B. Collins, 1850 - 316 pages |
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Common terms and phrases
altitude angular distance aphelion apparent diameter appear apsides ascertained astronomers axis azimuth celestial celestial sphere circle comet conjunction constellations declination degree described direction disk diurnal diurnal motion double stars earth earth's orbit earth's shadow eccentricity ecliptic equal equator equinoctial equinox figure fixed stars force globe gravity greater greatest heavenly bodies heavens Hence Herschel horizon horizontal parallax inclination inferior conjunction inferior planet instrument Jupiter latitude learner light longitude lunar magnitude measured Mercury meridian miles moon motion move nearly node oblique observations opposite parallax parallel passes perigee perihelion period perpendicular planetary pole quantity of matter refraction respect revolution revolve right angles right ascension ring satellites Saturn seen semi-diameter side sidereal sidereal day solar spectator sphere sun and moon sun's superior conjunction superior planets supposed surface syzygies telescope tides tion Uranus velocity Venus vernal equinox west to east