Astrological Sign Libra is the seventh sign of the Zodiac. It is a Cardinal sign and an Air element, ruled by Venus. The Sun enters Libra on our around September 23rd or the moment of the Autumnal equinox and leaves Libra on or around October 22nd. Libra Personality Libras are social, intellectual, fair-minded and willing to compromise. Compatibility See also Synastry Libras ...