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 33060HIP 33067HIP 33097HIP 33098HIP 33118HIP 33129HIP 33131HIP 33134HIP 33145HIP 33149HIP 33150HIP 36243HIP 36249HIP 36262HIP 33179HIP 33203HIP 33204HIP 33205HIP 33212HIP 33219HIP 33226HIP 33230HIP 33239HIP 33240HIP 33241HIP 38630HIP 36340HIP 36350HIP 36354HIP 36357HIP 36412HIP 33251HIP 33258HIP 33262HIP 33287HIP 38637HIP 38638HIP 38643HIP 38648HIP 36430HIP 33314HIP 33325HIP 33326HIP 33331HIP 33332HIP 38657HIP 38658HIP 38661

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.