Lifestyle >Astrology Everything You Need to Know About the Sign of Libra (and Its Influence on You) There's beauty in balance. Libra DatesThose born between September 23 and October 23 of any year entered the world under the constellation of Libra, making this sign their Sun sign. Yet whether Libra is your Sun sign, Moon sign, rising sign, or some other placement in your birth chart, it plays a role in your life. Is Libra an Air Sign? Libra is an air sign which means air as its dominant element.