What is Libra in Western astrology?

Definition

Libra is one of the twelve signs of the Western astrological sign wheel, occupying 180° to 210° of celestial longitude and transited by the Sun on average between September 24 and October 23.

In plain words

Libra is one of the twelve signs of the Western astrological sign wheel, defined as the span of celestial longitude from 180° to 210°. Wikipedia's Libra article reports that the Sun transits this sign on average between September 24 and October 23. Within astrology it is usually read as the sign of the scales, linked to balance, justice, and weighing one view against another.

Also asked as

• What does Libra mean in Western astrology?
• What are Libra's element, mode and ruler?
• Is Libra a sign or a constellation?
• What are the traditional dignities in Libra?

History

Richard Hinckley Allen, in Star Names, reports that the early Greeks did not associate Libra's stars with a Balance, so many have thought the constellation substituted in comparatively recent times for the Chelae, the Claws of the Scorpion, and that Ptolemy counted eight components in the two divisions of his Chelae. Allen also reports that the Romans added Libra to the original eleven signs, and that it first appears as Libra in classical times in the Julian calendar that Caesar formed in 46 B. C. Allen writes that Libra was stamped on the coins of Palmyra and of Pythodoris, queen of Pontus, and that Manetho and Achilles Tatios said Libra originated in Egypt.²

Quick timeline

1. Early record — Richard Hinckley Allen, in Star Names, reports that the early Greeks did not associate Libra's stars with a Balance, so many have thought the constellation substituted in comparatively recent times for the Chelae, the Claws of the Scorpion, and that Ptolemy counted eight components in the two divisions of his Chelae. Allen also reports that the Romans added Libra to the original eleven signs, and that it first appears as Libra in classical times in the Julian calendar that Caesar formed in 46 B. C. Allen writes that Libra was stamped on the coins of Palmyra and of Pythodoris, queen of Pontus, and that Manetho and Achilles Tatios said Libra originated in Egypt.²
2. Classical framework — Ptolemy's Tetrabiblos places Libra in the masculine and diurnal class with Aries, since the equinoctial circle drawn through them completes the primary movement of the universe.¹
3. Later transmission — Ptolemy's Tetrabiblos groups Libra with Aries as the two equinoctial signs, noting that the sun makes night and day exactly equal when it is at the beginning of each.¹
4. Modern usage — In the Tetrabiblos, Libra is classed as a cardinal air sign with positive polarity. These are formal categories within that text, not measured physical properties, and they show how the classical system organised the wheel into named groups for interpretation.¹

What classical and modern sources say

Classical view

Ptolemy's Tetrabiblos places Libra in the masculine and diurnal class with Aries, since the equinoctial circle drawn through them completes the primary movement of the universe.¹

Ptolemy's Tetrabiblos groups Libra with Aries as the two equinoctial signs, noting that the sun makes night and day exactly equal when it is at the beginning of each.¹

In the Tetrabiblos, Libra is classed as a cardinal air sign with positive polarity. These are formal categories within that text, not measured physical properties, and they show how the classical system organised the wheel into named groups for interpretation.¹

Modern view

Libra's symbol of the scales is based on the Scales of Justice held by Themis, the Greek personification of ancient sacred law, and she inspired modern depictions of Lady Justice. Astrology.com states that Libra's element is air, a light, dispersive element that ancient astrologers linked to formlessness, adaptability, and dissolution, and that Libra is the third of the four cardinal signs. Astrology.com identifies Venus as the planetary ruler of both Libra and Taurus, and describes Libra as Venus's diurnal home.⁴⁶

The building blocks and rulership

Sign wheel position

Libra is one of the twelve signs of the Western astrological sign wheel, spanning 180° to 210° of celestial longitude. Wikipedia's Libra article reports that the Sun transits this sign on average between September 24 and October 23, which gives a reader a measured place on the wheel to start from.⁴

Element and rulership

Astrology.com states that Libra's element is air, a light, dispersive element that ancient astrologers linked to formlessness, adaptability, and dissolution, and that Libra is the third of the four cardinal signs. According to Astrology.com, Venus is the planetary ruler of both Libra and Taurus, with Libra considered Venus's diurnal home.⁶

Symbol and justice link

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, which reflects the sign's long link with justice. The scales themselves are based on the Scales of Justice held by Themis, the Greek personification of ancient sacred law.⁴

Early history and calendar

Richard Hinckley Allen reports in Star Names that the early Greeks did not associate Libra's stars with a Balance, so many have thought the constellation replaced the Chelae, the Claws of the Scorpion. Allen also reports that the Romans added Libra to the original eleven signs, and that it first appears as Libra in classical times in the Julian calendar that Caesar formed in 46 B.C.²

The astronomy

Libra spans 180° to 210° of celestial longitude, and the Sun passes through this sign on average between September 24 and October 23. This span is a measured position on the sign wheel, separate from any symbolic reading of the sign.⁴

Libra, traditionally ruled by Venus, stands opposite Aries, ruled by Mars: the two signs sit 180 degrees apart. The distinction keeps measured quantities separate from symbolic meanings, and a reader can verify the offset directly from the wheel.¹

Ptolemy's Tetrabiblos ties the equinoctial signs to the moment the sun makes night and day exactly equal, which places Libra at the autumnal equinox point of the sign wheel.¹

Where astrologers differ

Ptolemy's Tetrabiblos assigns Libra to Venus as a house, pairing it with Taurus as the two signs given to that planet because of their fertility. Wikipedia's Libra article states that Libra is the only zodiac sign represented by an object, while the other eleven signs are represented by an animal or a mythological character, though some depictions show a man holding the scales. The Wikipedia article on Astrology notes that Libra appears on the Dendera Zodiac, a 1st century BCE Egyptian zodiac, which shares two signs, the Balance and the Scorpion, with Mesopotamian astrology.

Then and now

Then

Ptolemy's Tetrabiblos places Libra in the masculine and diurnal class with Aries, since the equinoctial circle drawn through them completes the primary movement of the universe.¹

Now

Libra's symbol of the scales is based on the Scales of Justice held by Themis, the Greek personification of ancient sacred law, and she inspired modern depictions of Lady Justice. Astrology.com states that Libra's element is air, a light, dispersive element that ancient astrologers linked to formlessness, adaptability, and dissolution, and that Libra is the third of the four cardinal signs. Astrology.com identifies Venus as the planetary ruler of both Libra and Taurus, and describes Libra as Venus's diurnal home.⁴⁶

Worked out from the evidence

Reasoned from the cited facts, not stated outright by any one source.

Libra's sign-wheel position and its symbol of the scales both point to the same tradition of weighing and fairness, so the astronomical span and the justice link read together as one reference frame for the sign.

Because Ptolemy placed Libra opposite Aries and Venus rules it in the Tetrabiblos and in Astrology.com's account, a reader can trace Libra's place on the wheel and its planetary ruler as two separate facts that both come from the classical scheme.

Not yet confirmed

• Whether the Greeks' lack of a Balance association means the constellation of Libra replaced the Chelae is left unsettled by the sources, since Allen says many have thought so without establishing it.

Follow the parts of Libra

Continue through Virgo, Scorpio.

Questions people also ask

What does Libra mean in Western astrology?

Libra is one of the twelve signs of the Western astrological sign wheel, spanning 180° to 210° of celestial longitude. Wikipedia's Libra article says the Sun transits it on average between September 24 and October 23.⁴

What are Libra's element, mode and ruler?

Astrology.com states that Libra's element is air and that Libra is the third of the four cardinal signs. It also identifies Venus as the planetary ruler of both Libra and Taurus, with Libra considered Venus's diurnal home.⁶

Is Libra a sign or a constellation?

In the Tetrabiblos, Ptolemy treats Libra as a sign of the wheel, grouped with Aries as an equinoctial sign. Allen's Star Names notes that the early Greeks did not associate its stars with a Balance, so the constellation and the sign are distinct.¹²

Method and review

Every statement about Libra was checked against the wording of its 6 sources (Ptolemy (LacusCurtius), Allen's Star Names, Encyclopaedia Britannica, Wikipedia and Astrology.com), and its positions and boundaries were calculated with Astronomy Engine. How the Machine works.