Outlines of astronomy

action actual advance amount angle angular appear arise astronomical attraction axis become body bright calculation called cause circle comet compared complete considerable considered continually corresponding course described determined diameter difference direction distance disturbing earth ecliptic Edition effect elements equal equator error evident exact excentricity existence fact figure fixed follows force former give given greater heavens History horizon inclination increase instance interval known latitude latter least length less light longitude magnitude mass mean measure meridian minute moon motion nature nearly node object observed opposite orbit parallel passing period planet pole portion position precisely present produced proportion reason referred regarded remain remarkable represented respect result ring rotation round seen side sidereal situation solar sphere stars station successive sun's suppose surface telescope tion true visible vols whole