Vir · Virginis
Virgo Constellation
IAU constellation mapVirVirgo (Vir) is one of the 88 constellations recognised by the International Astronomical Union. It covers 1294 square degrees of the equatorial sky in quadrant SQ3. Its brightest star is Spica. The Latin genitive of the name is Virginis, used to form star names within the constellation. In Greek mythology, Virgo is associated with greek tradition. The IAU standardised all constellation boundaries in 1930.
Quick facts
- IAU name
- Virgo
- Abbreviation
- Vir
- Latin genitive
- Virginis
- Hemisphere
- equatorial
- Area
- 1,294 sq deg
- Brightest star
- Spica
- Quadrant
- SQ3
- Family
- Zodiac
- Mythology origin
- Greek
- Discovery era
- Ptolemy's 48 (Almagest, c. 150 CE)
Mythology
Virgo is the largest zodiacal constellation and the second-largest of all 88 IAU constellations, covering 1294 square degrees. It is most commonly identified with Demeter (Ceres), goddess of the grain harvest, or with her daughter Persephone. In the mythological framework Virgo holds a stalk of grain (marked by the bright star Spica) and represents the bounty of the harvest season. When the Sun is in Virgo (late summer and autumn in classical antiquity, though precession has shifted these dates), the harvests were being gathered — a tidy coincidence that ancient sky-gazers readily noticed. An alternative identification links Virgo with Dike or Astraea, goddess of justice, who was the last of the immortal beings to leave the Earth at the end of the Golden Age. As human civilisation declined through the Silver and Bronze Ages, the gods progressively abandoned the world; Dike was the final departure, ascending to the stars as Virgo, placed beside the Scales of Justice (Libra). Spica (Alpha Virginis), the constellation's brightest star at magnitude 0.97, is a binary system consisting of two blue giant stars orbiting each other every four days, about 250 light-years from Earth. The Virgo Cluster, centred within this constellation, is the nearest large galaxy cluster to the Milky Way, containing more than 1300 galaxies.
Sources: Aratus Phaenomena 96-136; Ovid Metamorphoses 1.149-150; Hyginus Astronomica 2.25.
Overview
Virgo is one of the 88 constellations formally recognised by the International Astronomical Union (IAU). It occupies 1294 square degrees of sky in the equatorial sky region, crossing both hemispheres, best visible at latitudes between +45 and -90 degrees in June. The constellation belongs to the Zodiac family of constellations. Its Latin genitive is Virginis, the form used when naming stars within the constellation — for example, the brightest star Spica may appear in catalogues as Alpha Virginis or similar. The IAU standardised the boundaries of all 88 constellations in 1930 under the direction of Eugène Delporte, using straight lines of right ascension and declination to eliminate the ambiguities of earlier variable-boundary systems.
Notable stars
The brightest star in Virgo is Spica. Individual stars within Virgo are conventionally named using Bayer designation — Greek letters followed by the Latin genitive of the constellation name (Virginis) — introduced by Johann Bayer in his 1603 star atlas Uranometria. Flamsteed numbers (numeric designators followed by Virgo) were added by John Flamsteed in his 1712 catalogue. Variable stars, double stars, and deep-sky objects within the Virgo boundary are catalogued by the IAU with the abbreviation Vir.
History and mythology
The figure of Virgo appears in the classical astronomical tradition. Ptolemy included this constellation in the Almagest (c. 150 CE), the definitive ancient catalogue of 48 constellations, which formed the foundation for Islamic, medieval European, and Renaissance astronomy. The constellation's figure and mythology were transmitted through works such as Aratus's Phaenomena, Eratosthenes's Catasterismi, and Hyginus's Astronomica. See the Mythology section above for the full narrative.
Sources & further reading (2)
- official-iau — accessed 2026-05-06
- encyclopedia — accessed 2026-05-06
Frequently asked questions
What does the name Virgo mean?
Virgo is the Latin name used by the IAU to designate this constellation. The name comes from classical Latin and Greek astronomical tradition. In star catalogues, stars within Virgo are designated using the genitive form of the name (e.g. Alpha Virgo or similar Latin genitive forms) — a naming convention introduced by Johann Bayer in his 1603 atlas Uranometria and still in use today.
How large is Virgo compared to other constellations?
Virgo covers 1294 square degrees of sky. The full sphere of the sky contains 41,253 square degrees, so Virgo occupies about 3.1% of the total sky. For comparison, the largest constellation is Hydra at 1303 square degrees; the smallest is Crux at 68 square degrees.
When and where is Virgo visible?
Virgo straddles the celestial equator and is visible from both hemispheres, though part of it may be low on the horizon depending on the observer's latitude. The brightest star, Spica, serves as the main visual anchor for locating the constellation. As with all constellations, the best viewing conditions are a dark sky away from artificial light pollution, with the constellation high enough above the horizon to minimise atmospheric absorption.
