Algeiba. Star Leonis. S.H.A. 206°; Dec. N 20°; Mag. 2-3.
Algenib.Star Pegasi. S.H.A. 357°; Dec. N 15°; Mag. 2-9.
Algol. Star Persei and, also Medusae. Is a binary star, one dark and one light, and varies between 3rd and 5th magnitudes in less than 3 days. S.H.A. 314°; Dec. N 41°. Name is Arabic for 'ghoul' or 'demon'. Was probably looked upon as the winking eye of a monster.
Alhena 11 Alow
Alhena. Star Geminorum. S.H.A. 261°; Dec. N 16°; Mag. 1-9.
Alidade. Pivoted sight bar that moves over a graduated arc.
Alioth. Star Ursae Majoris. S.H.A. 167°; Dec. N 56°; Mag. 1-7.