Elements of Astronomy: Accompanied with Numerous Illustrations, a Colored Representation of the Solar, Stellar, and Nebular Spectra, and Celestial Charts of the Northern and Southern Hemisphere |
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Common terms and phrases
angle aphelion apparent motion apparent movements appear astronomers atmosphere attraction axis Boötes bright called celestial equator celestial pole celestial sphere centre changes circle clock color comet constellations density Describe determined diameter direction disk distance Earth Earth's orbit Earth's rotation Earth's surface equal equatorial eye-piece fact globe gravity heat heavenly body heavens hemisphere Hence horizon inclined inferior planet Jupiter latitude length lens light longitude lunar magnitude Mars mass mean Sun Mercury meridian meteors miles Moon Moon's move naked eye nearest nearly nebulæ Neptune night node northern object-glass observed parallax path perihelion period photosphere polar position prism rays refraction represented revolution revolve round right ascension ring round the Sun satellites Saturn seen shadow sidereal solar day solstice southern spectrum spots stars Sun's superior planet suppose tance telescope tion Uranus Ursa vapor variable stars velocity Venus vernal equinox visible zenith zenith-distance