Quick answer: Spica is Alpha Virginis, the brilliant blue-white "ear of grain" star in the constellation Virgo. In astrology it is reputed one of the most fortunate of all fixed stars, of the nature of Venus with a lesser Mars, said to give riches, honour and a love of art and science, especially when angular. In the tropical zodiac its longitude falls near 24 degrees of Libra.
Among all the fixed stars, Spica enjoys one of the warmest reputations in the tradition. Where Algol terrifies and Regulus commands, Spica simply blesses. Its name is Latin for "ear of grain," the spike of wheat held in the hand of the celestial Maiden, and the symbolism is fitting: this is the star of harvest, gifts and increase. Classical astrologers ranked it among the most fortunate points in the entire sky. To understand why, it helps to look at the star itself, the zodiac it occupies, and the rich layers of meaning later writers attached to it.
The Brightest Star of the Maiden
Astronomically, Spica is Alpha Virginis, the brightest star in the constellation Virgo and one of the brightest in the whole night sky. It is a brilliant blue-white star, often described in the older astrological texts as a "flushed white." Its brightness varies slightly, between roughly magnitude 0.97 and 1.04, so it is conventionally counted as a first-magnitude star. On the star maps it marks the ear of wheat, the spike of grain, held by the Maiden, which is exactly what its Latin name records.
The physical star is more than it appears. Spica is a close spectroscopic binary, a system of two hot, massive B-type stars locked in a tight orbit, with the primary a blue B1 main-sequence star. What we see as a single first-magnitude point is their combined light. This is purely an astronomical fact and does not change the classical reading. The tradition treats Spica as a single, fortunate point of light, and it would be a category error to read the binary structure as some kind of "dual nature" in delineation. Keep the astronomy and the astrology on separate shelves.
One technical detail does matter for the astrology. Spica lies only about 2 degrees from the ecliptic, the apparent path of the Sun, with an ecliptic latitude of around minus 2.06 degrees, just south of that plane. In fact it is the one bright Virgo star that sits south of the ecliptic. This low latitude means the Moon, and occasionally the planets, can pass very close to Spica and even occult it. That is precisely why it forms such tight, frequent conjunctions with the lights and planets, which gives it astrological weight. Note that the relevant quantity here is ecliptic latitude, the star's nearness to the plane, not its zodiacal longitude. The two are different measurements and should not be confused.
Virgo the Constellation, Libra the Sign
Here lies the single most important point of confusion about Spica, and it is worth getting right. Spica physically sits in the constellation Virgo. Yet in the tropical zodiac, the one most Western astrologers use, its ecliptic longitude has long since moved into the sign of Libra. At present it sits at roughly 24 degrees of Libra. In the sidereal zodiac, by contrast, it lies in late Virgo, near 29 to 30 degrees of that sign.
So when you read that Spica is in "late Virgo" and elsewhere that it is at "24 degrees Libra," these are not contradictory claims. They describe the same star in two different zodiacs. The "late Virgo" figure is its sidereal or constellational position; the "Libra" figure is its tropical sign placement. Always specify which zodiac you mean. The article title's phrase "late Virgo" is true of the sidereal position, not of the tropical sign.
The exact minutes are epoch-dependent. Older tables following Robson give about 23 degrees 50 minutes of Libra for the year 2000, while current reckoning puts it closer to 24 degrees 07 minutes of Libra. The figure slowly increases over time because of precession, so treat the precise minutes as belonging to a particular epoch rather than fixed forever. To see whether Spica falls within orb of any planet or angle in your own birth chart, it is plotted at its precessed longitude for your exact moment of birth.
This drift is no small footnote. Spica was historically central to the discovery of precession itself. In the second century BCE, Hipparchus compared his own measurement of Spica's longitude with the earlier records of Timocharis, made around 283 BCE. Timocharis had placed Spica 8 degrees west of the autumn equinox; Hipparchus found it at 6 degrees, a shift of about 2 degrees in roughly 150 years. From this he deduced the precession of the equinoxes at not less than about 1 degree per century. The modern value works out to roughly 1 degree every 72 years, which over the centuries has carried Spica's tropical longitude from Virgo into Libra.
The Nature of Venus
For the meaning of Spica we turn to Ptolemy. In the Tetrabiblos, in his chapter on the fixed stars, Ptolemy classes the star in the ear of grain of Virgo as "like that of Venus and, in a less degree, that of Mars." The weighting is essential. Spica is primarily Venusian, with Mars only as a secondary, lesser component. It is not an equal "Venus-Mars" blend. That Venus emphasis is the root of its fortunate, benefic reputation, its association with beauty, art, love and harmony.
It is fair to present this as Ptolemy's specific testimony rather than undisputed fact, because later authorities differed. The astrologer known as Alvidas read Spica as a blend of Venus, Jupiter and Mercury, dropping the Mars note entirely. Others have argued that a Venus-Mercury cast better fits Spica's links to the arts, music and commerce. So treat the Venus-with-lesser-Mars attribution as the Ptolemaic line, and the lighter, purely benefic readings as later refinements.
A Reputation for Good Fortune
Spica's fame rests on the testimony of traditional sources such as Robson, who hold that it is one of the most fortunate of all the fixed stars. Especially when rising on the Ascendant or culminating at the Midheaven, Spica is said to give unbounded good fortune, honours, riches and renown, together with a sweet disposition and a love of art and science. It is held to favour scientists, writers, painters, sculptors and musicians in particular, the makers and the gifted.
One caution keeps this honest. The strongest fortunate testimony is tied to Spica being angular, on the Ascendant or Midheaven, or conjunct the lights or the benefic planets. It is not a blanket promise attached to the star wherever it happens to sit. Classical delineation is always conditional on angularity and dignity. So avoid the lazy idea that any contact with Spica guarantees fortune. Read it instead as a strong, favourable current that the rest of the chart can amplify or mute.
Spica the Behenian Star
Spica also belongs to a special set in the magical tradition. It is the tenth of the fifteen Behenian fixed stars, a list drawn from medieval and Renaissance image-magic, set out by writers such as Agrippa in his Three Books of Occult Philosophy, where the text plainly says "the tenth is called Spica." Each Behenian star carried its own talismanic power and its own magical sigil or character, used to draw down the star's virtue into a physical talisman.
The word "Behenian" derives from the Arabic bahman, meaning "root," and the category is a magical and talismanic one, quite distinct from ordinary natal delineation. It belongs to the tradition of image-magic and talismans, not to mainstream chart reading, so it should not be presented as a standard natal-astrology heading.
Agrippa records Spica's correspondences in detail. Its stone is the emerald, and its plants are sage, trefoil or clover, periwinkle, mugwort and mandrake. Its talismanic image is a bird, or a man laden with merchandise, made to procure wealth, win victory in lawsuits, and take away scarcity and mischief. It is important to read these as Behenian correspondences specific to the talisman tradition, not generic "lucky stones" of the star. The prosperity and protective virtues, the winning of lawsuits and the dispelling of want, are properties of the consecrated talisman in that tradition, not automatic promises of a natal placement.
Frequently Asked Questions
Is Spica really a lucky star?
By reputation, yes. Traditional sources rank Spica among the most fortunate of all the fixed stars, of the nature of Venus, linked to riches, honour, renown and a love of art and science. The important qualification is that this fortunate testimony is strongest when Spica is angular, rising or culminating, or conjunct the lights and benefic planets. Treat it as a favourable current that depends on the rest of the chart, not a guarantee.
Is Spica in Virgo or Libra?
It depends on which zodiac you mean. Spica physically lies in the constellation Virgo and, in the sidereal zodiac, near 29 to 30 degrees of Virgo. In the tropical zodiac used by most Western astrologers, however, its longitude has drifted into Libra and now sits at roughly 24 degrees of that sign. Both descriptions are correct for the same star; you simply have to specify the zodiac.
What nature did Ptolemy give Spica?
In the Tetrabiblos, Ptolemy describes the star in the ear of grain of Virgo as "like that of Venus and, in a less degree, that of Mars." So its nature is primarily Venusian, with Mars as a lesser, secondary note, not an equal blend. Later astrologers such as Alvidas dropped the Mars component and read it as Venus, Jupiter and Mercury, which is why the Venus emphasis is best given as Ptolemy's specific view. For more on this layer of the chart, see our guide to fixed stars.