A Manual of Spherical and Practical Astronomy: Spherical astronomy

aberration accuracy altitude approximate ascension and declination axis azimuth BESSEL celestial celestial sphere centre chronometer co-ordinates computed constant Corr corresponding cos² d₁ deduced denote determine difference of longitude earth eclipse employed Ephemeris equal equinox expressed formula geocentric given gives Greenwich Greenwich mean h₁ hence horizon hour angle instant instrument interpolation interval latitude logarithms lunar mean meridian method moon moon's limb nearly noon nutation obtained P₁ parallax place of observation plane pole position precession precision prime vertical probable error proper motion quantity radius reduced refraction right ascension semidiameter sextant sidereal sin² solar solar eclipse sphere star star's station substitute sun's supposed T₁ term tion transit triangle true true longitude whence zenith distance δα