Aquarius

Aquarius (♒) is the eleventh astrological sign in the Zodiac, originating from the constellation Aquarius. In western astrology, the sign is no longer aligned with the constellation as a result of the precession of the equinoxes. In astrology, Aquarius is considered a "masculine", positive (extrovert) sign. It is also considered an air sign and is one of four fixed signs. Aquarius has been traditionally ruled by the planet Saturn, and, since its discovery, Uranus has been considered a modern ruler of this sign. Being the eleventh sign of the zodiac, Aquarius is associated with the astrological eleventh house.

Individuals born when the Sun was in this sign are considered Aquarius individuals. Under the tropical zodiac, the Sun is in Aquarius roughly from January 20 to about February 19. Under the sidereal zodiac, it is currently there roughly from February 13 to March 14. The Sanskrit name of Aquarius in Hindu astrology is Kuṃbha "pitcher".

Based on Elements within the Zodiac, Aquarius is considered compatible with Libra, Gemini, Sagittarius and Aquarius itself.
There are many variables that determine compatibility in astrology, such as birth dates, birth months, birth years, position of a sign within the Sun, the Moon, Stars, etc. The signs listed as compatible with Aquarius do not reflect an individual profile or individual reading as interpreted within astrology, but rather reflect a general guideline and reference to compatibility as dictated by variables such as Qualities and Elements within the Zodiac.The branch of astrology dealing with interpersonal compatibilities is called Synastry.

Source : http://en.wikipedia.org/wiki/Aquarius