Gemini

Gemini, the Twins, represents Castor and Pollux from Greek mythology. Pollux, the brighter twin, is the closest giant star to the Sun and was the first giant star confirmed to host an exoplanet. Castor is actually a sextuple star system. The Geminid meteor shower, one of the year's best, radiates from this constellation in December.

The Zodiac family comprises the 12 constellations that lie along the ecliptic — the apparent path of the Sun across the sky over the course of a year. These are among the oldest recognized constellations, with origins in Babylonian astronomy dating back over 3,000 years. The ecliptic crosses each zodiac constellation at different widths, meaning the Sun spends varying amounts of time in each — from about 7 days in Scorpius to 45 days in Virgo.

Mythology & History

The zodiac constellations carry some of the richest mythological traditions in astronomy. Aries recalls the golden ram whose fleece was sought by Jason and the Argonauts. Gemini represents the twins Castor and Pollux, one mortal and one divine. Leo honors the Nemean Lion slain by Heracles as his first labor. The Babylonians originally used these constellations for agricultural timing, and their astrological associations developed later through Greek and Roman traditions. The modern astronomical boundaries were standardized by the IAU in 1930.

Observation Tips

Zodiac constellations are visible from both hemispheres since they straddle the celestial equator. Each is best observed when it reaches opposition (opposite the Sun in the sky), which occurs roughly six months from the dates when the Sun is in that constellation. The zodiac contains many spectacular deep sky objects: the Orion-adjacent Taurus hosts the Pleiades (M45) and Crab Nebula (M1), Virgo is home to the Virgo Cluster of galaxies, and Sagittarius points toward our galaxy's center with its dense Milky Way star clouds.

HIP 31508HIP 31525HIP 31531HIP 31535HIP 31536HIP 29866HIP 34779HIP 29668HIP 29749HIP 29757HIP 29810HIP 29867HIP 28871HIP 28884HIP 30003HIP 31545HIP 31568HIP 30333HIP 30396HIP 30399HIP 30400HIP 29967HIP 29968HIP 29979HIP 30487HIP 28920HIP 28932HIP 32120HIP 32122HIP 30726HIP 30734HIP 30749HIP 30755HIP 34745HIP 30998HIP 30046HIP 30049HIP 30075HIP 31618HIP 31098HIP 31100HIP 31156HIP 31158HIP 31172HIP 31177HIP 34810HIP 34812HIP 31236

Frequently Asked Questions

What is the Gemini constellation?
Gemini (Gem) is one of the 88 IAU-recognized constellations in the Northern hemisphere. Gemini, the Twins, represents Castor and Pollux from Greek mythology. Pollux, the brighter twin, is the closest giant star to the Sun and was the first giant star confirmed to host an exoplanet. Casto
How many stars are cataloged in Gemini?
StarFYI currently catalogs 1,471 stars in the constellation Gemini.
What is the brightest star in Gemini?
The brightest star in Gemini is Pollux.
How large is the Gemini constellation?
Gemini covers 513.76 square degrees of the sky.
What family does Gemini belong to?
Gemini belongs to the Zodiac Family of constellations.