May 21, Gemini begins

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Sun enters Gemini, 3^rd sign of the Zodiac
(May 21 - June 20)  

Gemini (the twins) is one of the constellations of the zodiac. It is part of the northern winter sky, lying between Taurus to the west and the dim Cancer to the east, with Auriga and the near-invisible Lynx to the north and Monoceros and Canis Minor to the south. The Gemini program is named for it.

Gemini includes two bright stars, named after the two twins, who correspond to the Dioscuri in Greek mythology – Castor (α), a pretty telescopic binary (actually sextuple), and Pollux (β), which is brighter and more south-westerly. The other stars are relatively dim – only one, Alhena (γ) is ever seen from a large city – and trace out a rectangle to the southeast.

This constellation is identified with the Dioscuri, Castor and Pollux (or Polydeuces), for whom its brightest stars are also named. These twin brothers were the brothers of Helen of Troy and Clytemnestra, by Leda.
The astrological sign Gemini (May 21 - June 20) is associated with the constellation. In some cosmologies, Gemini is associated with the classical element Air, and thus called an Air Sign (with Libra and Aquarius). Its polar opposite is Sagittarius.
Astrology    The Real Constellations of the Zodiac    Astrology: Pro    Astrology: Con

The brothers Bagadjimbiri

From Wikipedia, the free encyclopedia.
In Australian Aboriginal mythology (specifically: Karadjeri), the Bagadhimbiri are two brothers and creator gods. They arose from the ground as dingos and made water-holes, sex organs (from a mushroom and another fungus) for the androgynous first people, and invented circumcision. Taking human form, the Bagadjimbiri began an argument with Ngariman, a cat-person. Ngariman was annoyed by the Bagadjimbiri's laughter. He killed the brothers underground, but was drowned by Dilga, their mother, who flooded the underground murder-spot with her milk, which also revived her sons. The Bagadjimbiri eventually turned into snakes and went to live in the sky as clouds.

A list of twins, including multiple twins, conjoined twins, modern twin celebrities, twins in sports, mythological twins, historical twins, fictional twins, famous people who had a twin and records related to twins.
Hi'ikia and Cho'i the Twins, a Yaqui myth   
More twin stories at Sacred Texts    Dioscuri at Sacred Texts