Sagittarius (♐) is the ninth of the astrological signs in the Zodiac, originating from the constellation of Sagittarius. Sagittarius is considered a “masculine”, positive (extrovert) sign. It is also a fire sign and one of the four mutable signs. Sagittarius is ruled by the planet Jupiter. Individuals born when the sun was in this sign are considered Sagittarius individuals. Under the tropical zodiac, the sun enters Sagittarius on November 22 and exits on December 21. Under the sidereal zodiac, it is currently there roughly from December 17 to January 20.
Zodiac Symbol: The Archer
Duration (Tropical, Western): 22 November – 22 December (2011, UTC)
Duration (Sidereal, Hindu): 14 December – 2 January (2011, UTC)
Zodiac Element: Fire
Zodiac Quality: Mutable
Domicile: Jupiter (day), Neptune (night)
Exaltation: South Node
Fall: North Node
In Greek mythology, Sagittarius is identified as a centaur: half human, half horse. In some legends, the Centaur Chiron was the son of Philyra and Saturn, who said to have changed himself into a horse to escape his jealous wife, Rhea. Chiron was eventually immortalized in the constellation of Centaurus or in some versions, Sagittarius
Generally, they are considered to be compatible with the natives of the other fire signs, Aries and Leo the natives of the air signs, Gemini, Libra and Aquarius. Virgo and Pisces are signs of the other nature (feminine/introverted), but are considered semi-compatible with Sagittarius due to their having the same mutable quality.
There are many variables that determine compatibility in astrology, such as birth dates, birth months, personalities, birth years, position of a sign within the Sun, the Moon, Stars, planets, etc. The signs listed as compatible with Sagittarius 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 in astrology dealing with interpersonal compatibilities is called Synastry.
Definition courtesy Wikipedia.