The faintest constellation of the zodiac, in which the Sun lies for three weeks from late July until mid-August. Cancer represents a crab. Its brightest star, Beta Cancri, is magnitude 3.5; Zeta Cancri is a double star of magnitudes 5.1 and 6.2. The main feature of the constellation is the open star cluster M44, Praesepe. There is also a smaller 7th-magnitude star cluster, M67, ½° wide.