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 30501HIP 30548HIP 30560HIP 30569HIP 30570HIP 30571HIP 35404HIP 33752HIP 33753HIP 33757HIP 30574HIP 30586HIP 30588HIP 30612HIP 33767HIP 30644HIP 30647HIP 30648HIP 30698HIP 38442HIP 38447HIP 33859HIP 30722HIP 30723HIP 30724HIP 30771HIP 33965HIP 33974HIP 30799HIP 30801HIP 30839HIP 34043HIP 34055HIP 34057HIP 30857HIP 30880HIP 30890HIP 30893HIP 30900HIP 30914HIP 30954HIP 30958HIP 30965HIP 30975HIP 34172HIP 34180HIP 34203HIP 30984

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.