Practical and Spherical Astronomy: For the Use Chiefly of Students in the Universities

aberration amount angle apparent applied approximately assumed astronomical axis azimuth body calculated called centre circle colatitude collimation computed considered correction corresponding declination deduced described determined difference direction distance Draw earth easily ecliptic effect equal equation equatorial equinox error expressed fixed formulæ geocentric give given Greenwich Hence horizontal hour-angle inclination interval known latitude length light limb longitude mean mean solar measured meridian method moon moon's motion move nearly necessary node object Observatory observed orbit parallax passing perpendicular planet polar pole position preceding precession produced quantity radius reading referred refraction represent respect right ascension seen side sidereal sin z sinº star stations sun's suppose surface tables taken telescope tion transit true Venus vertical whole wires zenith zenith-distance