Taurus is a bull because ancient civilizations saw a bull’s shape in that patch of stars and attached their most important bull myths to it. The association stretches back at least 5,000 years to ancient Sumer, and possibly much further. Two major mythological traditions explain the connection: the Mesopotamian story of the Bull of Heaven and the Greek myth of Zeus disguising himself as a white bull.
The Mesopotamian Origin Story
Taurus is one of the oldest named constellations in the night sky, and its earliest known identity comes from ancient Sumer. The Sumerians saw it as the Bull of Heaven, a gigantic creature from the Epic of Gilgamesh. In that story, the goddess Ishtar sends the Bull of Heaven to destroy the city of Uruk after Gilgamesh rejects her advances. Gilgamesh and his companion Enkidu fight and slaughter the beast to protect their people.
This origin story also explains a detail that puzzles many stargazers: the constellation only shows the front half of a bull. The reason, according to Mesopotamian tradition, is that the bull was slaughtered and divided. Only the forepart appears in the sky.
The Greek Myth of Zeus and Europa
The Greeks inherited the constellation and layered their own mythology onto it. In their version, Zeus fell in love with Europa, a Phoenician princess. To get close to her without alarming her, he transformed himself into a gentle, beautiful white bull and appeared among her father’s herds. Europa was charmed by the animal’s calm temperament. She decorated him with flowers and eventually climbed onto his back. The moment she did, Zeus charged into the sea and carried her across the water to the island of Crete. The Greeks placed the bull in the sky to commemorate the story, which is why classical depictions of Taurus often emphasize its beauty and grace rather than ferocity.
What the Bull Looks Like in the Sky
The constellation’s brightest star, Aldebaran, sits 67 light years from Earth and marks the bull’s glowing eye. Its name comes from Arabic and means “the Follower,” because it appears to chase the Pleiades star cluster across the sky. Aldebaran has a distinct orange-red color that makes it easy to spot.
Behind Aldebaran, the Hyades star cluster forms the V-shaped face of the bull. Aldebaran looks like it belongs to the Hyades when you gaze upward, but it’s actually a foreground star. The Hyades are about 150 light years away, more than twice as far. Two long lines of stars extend from the face to form the bull’s horns, completing the front half of the animal. Above the bull’s back, the famous Pleiades cluster (the Seven Sisters) sits like a jewel on the bull’s shoulder.
A Bull in the Sky for 17,000 Years
The connection between bulls and this region of the sky may be far older than any written myth. In the Lascaux cave in southern France, paintings from roughly 15,300 BCE show a large aurochs (a wild ancestor of modern cattle) with a cluster of dots floating above its back. Researchers have noted a surprising resemblance between those dots and the position of the Pleiades relative to Taurus. Additional dots near the painting correspond well to the positions of Aldebaran and the Hyades, the other principal stars that form the bull’s face.
If that interpretation is correct, humans recognized this star pattern as a bull during the Upper Paleolithic era, more than 17,000 years ago. The idea remains debated, but the spatial match between the cave painting and the actual star positions is striking enough that multiple researchers have independently reached the same conclusion.
Why a Bull Mattered So Much
Bulls held enormous symbolic power in nearly every ancient culture that named the stars. They represented strength, fertility, and agricultural wealth. Taurus also held a privileged astronomical position: from roughly 4500 BCE to 2300 BCE, the sun was in Taurus during the vernal equinox, the moment that marked the start of spring. This meant the bull constellation literally heralded the planting season, tying it directly to survival and abundance. Cultures that depended on farming and herding would have seen the bull as the most important figure in the sky during the most important time of year.
That practical significance reinforced the mythological weight. A constellation marking the return of warmth and growth naturally attracted stories about powerful, divine creatures. By the time Greek and Roman astronomers formalized the 12 zodiac constellations, the bull’s place among them was already thousands of years old.