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 30354HIP 32903HIP 32922HIP 32925HIP 34853HIP 34856HIP 34858HIP 34859HIP 34860HIP 34861HIP 34865HIP 34881HIP 33086HIP 33166HIP 33181HIP 33190HIP 33191HIP 33194HIP 34883HIP 34885HIP 30393HIP 31797HIP 31802HIP 33300HIP 33352HIP 33356HIP 33358HIP 33360HIP 31810HIP 30496HIP 31813HIP 31828HIP 31829HIP 30528HIP 33782HIP 33785HIP 33861HIP 33910HIP 33911HIP 33914HIP 33916HIP 33962HIP 33989HIP 33992HIP 34021HIP 34900HIP 34902HIP 34913

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.