Norton's Star Atlas and Reference Handbook (epoch 1950.0).

altitude angle aperture apparent apparent magnitude Astronomical atmosphere axis bright brighter Cassiopeiæ Catalogue celestial equator celestial sphere Centauri centre Cepheid co-ordinates colour comet constellation craters Cygni Declination diameter disk distance Earth ecliptic epoch equatorial Equinox eyepiece faint focal length Galactic Galaxy globular hemisphere horizon hour circle inferior conjunction inferior planets interstellar Jupiter latitude light Little change longitude luminosity lunar Lyræ magnitude Main Sequence Mare Mars mean Mercury meridian minor planets Mira type Moon nebula Nova novæ object glass observed open cluster orbit Orionis parallax parsecs planetary polar pole position proper motion R.A. Dec radiation Relatively fixed Right Ascension rotation period Sagittarii satellites Saturn seconds of arc seen sidereal Slow binary solar spectral Spectral Classification spectrum stellar Sun's sunspot surface TABLE telescope temperature transits Ursa Majoris Variable Stars velocity Venus visible wavelength ΟΣ