A Compendium of Astronomy: Containing the Elements of the Science

61 Cygni altitude angle angular appear astronomers atmosphere axis azimuth binary stars called celestial circle clock comet conjunction constellation degree diameter disk distance diurnal revolution double stars earth earth's orbit eclipse equal equator equinox exhibit Explain figure fixed stars force full moon globe gravity greater heavenly bodies heavens Hence Herschel horizon hour inferior conjunction inferior planets instrument Jupiter latitude learner light longitude lunar lunar eclipse magnitude measure Mercury meridian miles moon moon's mountains move nearer nearly nebula node oblique observations opposite orbit parallax parallel passing perihelion period planetary pole refraction represent respect revolve right ascension ring satellites Saturn seen shadow side sidereal day solar system space spectator sphere spots sun and moon sun's superior conjunction superior planets supposed surface tail tance telescope tide-wave tides tion transit tropic Uranus velocity Venus visible west to east zenith Zodiac