Zodiac myths · Gemini
Gemini is two brothers who refused to be split up
One twin could live forever. The other could not. So they made a deal with Zeus that still shows in the stars.
Johann Bayer, Uranometria, 1603
At a glance
In Greek myth Gemini is Castor and Pollux (Polydeuces), twin sons of Leda. When mortal Castor died, immortal Pollux shared his immortality so they could stay together.
- The figure
- The twins Castor and PolluxHomer, Odyssey 11.298-304
- Sign dates 2026
- May 21 to Jun 21, 2026Sun enters May 21, 2026, 00:37 UTC
- Sun in the stars, 2026
- Jun 22 to Jul 20, 202629 days inside the IAU Gemini
- Best seen at midnight
- Dec 22, 2026 to Jan 18, 2027best night about Jan 4, 2027
The myth
One mortal twin, one divine one
Try this today
- Think of your Castor: the person whose absence would make forever feel like too much.
- Write down two versions of yourself that never meet. What would they say to each other?
- On a January evening, find the twin stars and check which one looks brighter.
Leda, queen of Sparta, had twin boys with two fathers. Polydeuces, whom the Romans called Pollux, was a son of Zeus and could not die. Castor was the son of her mortal husband, Tyndareus, and could. Together they were the Dioskouroi, "the boys of Zeus," and they were inseparable: Castor famous for horses, Pollux for boxing. They sailed with Jason on the Argo.
Then came a fight over cattle. Apollodorus tells how the twins fell out with their cousins Idas and Lynceus, and in the brawl Castor was killed.
Pollux could have gone home to Olympus. He did not want it. He asked Zeus to let him give up his immortality, or share it, rather than live forever without his brother. Zeus allowed the share. Homer's Odyssey already knows the result: the brothers live on alternate days, one day among the living and one beneath the earth, always together.
The twins were also placed in the sky, two bright stars side by side that still carry their names. Sailors in the ancient Mediterranean prayed to them in storms, and the glow of St Elmo's fire on a ship's mast was read as the brothers coming to help.
Other tellings
Other twins in the same stars
Hyginus admits there was disagreement. Some astronomers, he says, called these stars Heracles and Apollo. The Castor-and-Pollux reading won out, and the Romans in particular loved the Dioskouroi: a temple to Castor stood in the Roman Forum from the early Republic.
The Babylonians also saw twins here: MUL.APIN lists the Great Twins (MAŠ.TAB.BA.GAL.GAL). So two bright stars close together read as a pair across very different cultures, long before anyone wrote down a Spartan family drama.
In the sky
Finding Gemini: Dec 22, 2026 to Jan 18, 2027
Find two bright stars of near-equal brightness above and left of Orion: Pollux is the brighter, slightly orange one, Castor the whiter one. Funny detail: the immortal twin's star is the brighter.
2026: sign May 21, 2026, 00:37 UTC to Jun 21, 2026, 08:25 UTC. Sun in the stars: Jun 22 to Jul 20, 2026 (29 days). (Why the 32-day gap.) Gemini peaks at midnight near Jan 4, 2027.
Pick your telling
Two bright stars close together read as twins in Babylon and in Greece.
3 versions of the twins Castor and Pollux.
Gemini, 3 ways
The shared immortality
After Castor dies fighting his cousins, Pollux asks Zeus to share his immortality, and the twins spend alternate days among the living and the dead.
Source: Homer, Odyssey 11.298-304; Apollodorus, Library 3.11.2
See it yourself. Gemini: Dec 22, 2026 to Jan 18, 2027.
More to read
One shorter read. It opens in place.
In astrology
What the twins mean in a chart
Gemini is ruled by Mercury, the messenger, and astrologers read it as the sign of pairs, talk and moving between two worlds. The myth goes further than "two-faced": the twins are loyal to the point of giving up half of eternity. If your Gemini placements make you feel split, the story says the split can be a bond rather than a contradiction.
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Gemini by the numbers
| Dates | Days | |
|---|---|---|
| Sign | May 21 to Jun 21, 2026 | 31 |
| Sun in the stars | Jun 22 to Jul 20, 2026 | 29 |
| Midnight season | Dec 22, 2026 to Jan 18, 2027 | 28 |
All times are UTC. In the Americas the local date can be a day earlier; in Asia and Australia a day later.
Quick answers
What is the Greek myth of Gemini?
Gemini is the twins Castor and Pollux. Pollux was immortal, Castor was not. When Castor was killed, Pollux shared his immortality so they could stay together, alternating between Olympus and the underworld.
Which Gemini twin is immortal?
Pollux (Polydeuces), the son of Zeus. Castor was the son of the mortal king Tyndareus.
Why are Gemini called the Dioskouroi?
Dioskouroi means "sons (or boys) of Zeus" in Greek. It names the pair even though only Pollux was strictly Zeus's son.
Who is the Greek god of Gemini?
The sign has no single god. Its myth is the twins, and astrologically Gemini is ruled by Mercury, the Roman Hermes.
Are Castor and Pollux real twins as stars?
No. They look like a pair from Earth but are at different distances. Pollux is the brighter of the two.
