Virgo is considered the most intelligent sign in the zodiac, as the place where Mercury is exalted. Virgo is the second-largest constellation. It spans the 150-180th degree of the zodiac. Under the tropical zodiac, the Sun transits this area on average between August 23 and September 22. As a mutable sign, Virgo is least consistent and reliable of all Earth signs in the zodiac. With all of their attention to detail in their professional or personal life.