Libra
Libra is the seventh sign of the tropical zodiac, spanning September 23 to October 22, beginning at the September equinox. It is an Air sign, Cardinal in modality, ruled by the planet Venus.
Last reviewed: 2026-07-19
Historical fact
Libra has an unusually late and well-documented origin among the signs: in Babylonian astronomy and the earliest Greek astrology, this sky sector was read as the Claws (Chelae Scorpionis) of the neighboring Scorpion, not as an independent symbol. It was astronomers and astrologers of the Roman era, roughly around the time of Julius Caesar's calendar reform (1st century BCE), who split the sector off into its own sign, represented as a set of scales — plausibly tied to Roman ideals of justice and balance. This makes Libra the only zodiac symbol depicting an inanimate object rather than a person or animal. Ptolemy's Tetrabiblos, around 150 CE, already records Libra as a full sign and fixes it as the seventh in the sequence, beginning at the September equinox.
Interpretation — Western Astrology (Tropical)
In modern Western astrology, Libra is read as the sign of balance and relationships: Cardinal energy (which initiates a new cycle) combined with the element Air (relating, intellect) under the rulership of Venus, the planet associated with harmony, beauty, and the pursuit of connection. Commonly associated traits: diplomacy, a sense of fairness, aesthetic sensibility, and a strong partnership-orientation. The shadow side commonly includes indecisiveness and a tendency toward conflict-avoidance even when confrontation is warranted.
Interpretation — Vedic Astrology (Sidereal)
In the Vedic system (Jyotish), the corresponding sign is Tula, also ruled by Venus (Shukra) and likewise the seventh of the twelve rashis. Because it uses the sidereal zodiac, which accounts for the precession of the equinoxes, Tula's date window is currently shifted relative to tropical Libra — today falling roughly from mid-October to mid-November, varying by the ayanamsa (calculation method) used. Classical texts such as the Brihat Parashara Hora Shastra describe Tula natives as diplomatic, fair-minded, and oriented toward balance in relationships, with a tendency toward indecision — a characterization broadly convergent with the Western reading, despite the two systems developing independently.
This section presents one tradition's interpretation, not a verifiable fact.
Frequently asked questions
- Why is Libra represented by scales rather than an animal or person?
- Because Libra has a later origin than the other signs: it was originally read as the Claws of the neighboring Scorpion. Roman-era astronomers and astrologers, around the 1st century BCE, split it off into its own sign represented as scales, making it the only inanimate-object symbol in the zodiac.
- Was Libra always a separate sign from Scorpio?
- No. In Babylonian astronomy and the earliest Greek astrology, the sector now occupied by Libra was treated as the Claws (Chelae) of the Scorpion. Its separation into an independent sign happened during the Roman era, around the time of Julius Caesar's calendar reform.
- Are Libra and Tula (Vedic) the same sign?
- They correspond to the same position in the sequence (seventh sign, ruled by Venus), but occupy different date windows, because the Vedic zodiac is sidereal (aligned to the constellations) while the Western zodiac is tropical (aligned to the seasons) — the gap today is roughly 24 degrees.
Sources
- Nicholas Campion. A History of Western Astrology (2009).
- Claudius Ptolemy. Tetrabiblos (c. 150).
- Maharishi Parashara (trans. R. Santhanam). Brihat Parashara Hora Shastra (1984).
- David Pingree. From Astral Omens to Astrology: From Babylon to Bīkāner (1997).