Libra is one of the three zodiac air signs, the others being Gemini and Aquarius. In astrology, a broad description of those who are born under these signs are calm, rational, and detached when dealing with situations. The sign of Libra is symbolized by the scales and is associated with the Roman deity Iustitia. According to the writer Manilius, Roman judges are born under the sign of Libra.

The Moon was said to be in Libra when Rome was founded and this was based on the historical passage, which state "qua condita Roma". Everything was balanced under this righteous sign.[citation needed] Manilius once said that Libra was the sign "in which the seasons are balanced". Both the hours of the day and the hours of the night match each other.[citation needed] Thus why the Romans put so much trust in the "balanced sign". Going back to ancient Greek times, Libra the constellation between Virgo and Scorpio used to be ruled over by the constellation of Scorpio. They called the area the Latin word "chelae", which translated to "the claws" which can help identify the individual stars that make up the full constellation of Libra, since it was so closely identified with the Scorpion constellation in the sky.

According to the tropical system of astrology, the Sun enters the sign of Libra when it reaches the northern autumnal equinox and the southern vernal equinox, which occurs around September 22.