Aries is an astrological sign that is associated with the constellation Aries. Under the tropical zodiac, Aries is occupied by the Sun from about March 21 to April 19 (depending on the exact year) and is associated with the Spring Equinox. Under the sidereal zodiac, it is currently from April 15 to May 15. The opposite sign to Aries is Libra. Aries is the first sign of the Zodiac and associated with fresh vigour and new beginnings. Individuals born under this sign are thought to have a confident, aggressive, energetic, active, adventurous, enthusiastic, fair, passionate, and pioneering character but one which is also prone to selfishness, boastfulness, intolerance, impulsiveness, and impatience. In terms of anatomy Aries is said to rule the cranium, jaw, facial bones, brain, upper teeth, carotid arteries, and nerve centres. Physically they are said to be tall in stature, and athletic in appearance. In terms of geography Aries is linked with Avignon, Alicante, Exeter, Manitoba, Micronesia, Switzerland, Swaziland, and Sweden. In mythology Aries is often associated with the Greek myth of the ram which carried Athamas's son Phrixus and daughter Helle to Colchis to escape their stepmother Ino, as well as the mythological figure of Theseus, from the Greek myth of the Minotaur. Aries is also associated with the Greco-Roman god Ares/Mars.