The Western astrological sign of Libra is part of the tropical zodiac (September 23 (Autumn equinox) – October 22) and the sidereal zodiac (October 18 – November 16). It is associated with the constellation Libra and the classical element Air, making it an Air sign. Libra is also one of the Cardinal signs (along with Aries, Cancer and Capricorn). Its symbol is the scales. Its ruling planet is Venus.
As an Air sign, Libra is associated with thought, perspective and communication. In combination with the other elements, air feels that water will obscure it, earth will suffocate it, but fire will inspire and uplift it. As a Cardinal sign, it is associated with initiation and creativity. Its polar opposite is Aries.