Aries (♈) (English pronunciation: /ˈeə.riːz/; meaning “ram”) is the first of the astrological signs in the Zodiac, named for the constellation of Aries, called “The Ram” in Hellenistic tradition, after the golden ram that rescued Phrixos, taking him to the land of Colchis. Aries is ruled by the planet Mars. Being the first sign in the zodiac, Aries is associated with the astrological first house. In Western astrology, Aries is often considered a “masculine”, positive (extrovert) sign. It is also considered a fire sign, and is one of four cardinal signs.
Individuals born when the Sun was in this sign are called Arians or Ariens.
Zodiac Symbol: Ram
Duration (Tropical, Western): 20 March – 20 April (2011, UTC)
Duration (Sidereal, Hindu): 14 April – 1 May (2011, UTC)
Zodiac Element: Fire
Zodiac Quality: Cardinal
Domicile: Mars, Pluto
Generally, Aries are considered to be strongly compatible with the natives of the other fire signs of Sagittarius and Leo. Aries are also compatible with the air signs of Gemini, Libra (The opposite of Aries), and Aquarius. Since Capricorn and Cancer are signs of the other nature (feminine/introverted), they are considered to be semi-compatible with Aries due to their having the same cardinal 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 Aries 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.