The Elements of the Theory of Astronomy

aberration altitude angular apparent diameter apparent place argument of latitude ascension and declination azimuth called clock conjunction consequently corresponding cos² described determined direction disk diurnal circle Earth Earth's center Earth's surface east ecliptic equal equator equinox error fixed stars formulæ geocentric greatest heavenly body heavens heliocentric Hence horizon hour angle inclination inferior planet intersection interval Jupiter known length line joining lunar lunar eclipse mean distance meridian zenith distance motion nearly node nutation observed parallax parallel passing perigee perihelion perpendicular plane point of Aries pole position precession radius vector refraction right ascension rotation round satellite seen semi-diameter shadow sidereal sidereal day sidereal period sin² solar eclipse solstice star's Sun and Moon Sun's declination supposed telescope tion transit triangle true true anomaly values velocity Venus vertical visible zenith distance