1. A zodiacal constellation in northern hemisphere between Cancer and Virgo.
2. The fifth sign of the zodiac; the sun is in this sign from July 23 to August 22; Also called: Leo the Lion.
Zodiacal constellation in the northern hemisphere represented as a lion. The Sun passes through Leo from mid-Aug to mid-Sept. Its brightest star is first-magnitude Regulus at the base of a pattern of stars called the Sickle. In astrology, the dates for Leo are between about 23 July and 22 Aug (see precession).