Constellations

Constellations, the groups into which the stars have been divided by astronomers. Many of them, such as the Pleiades, Orion, and the Great Bear, were identified and named in early times. Ptolemy enumerates forty-eight constellations in his Almagest, twelve of which are in the zodiac, twenty-one in the northern celestial hemisphere, and fifteen in the southern. Some of the old ones have sinceDI