Gemini

The Summer Solstice occurs when the Sun is in Gemini (21 to 22 June). A prominant constellation above Orion.

Gemini - "Gemini" is the Latin translation of the Greek Didymoi, "the Twins." 

Gemini, the Twins

Pollux and Castor were twin brothers. They were the twin sons of a mortal woman Leda –they had different fathers. Pollux was a son of the chief Olympian god Zeus, and was immortal. Castor, however, was the son of a mortal man, and so he could die.

Their love and devotion for one another was legendary, and they never separated from one another.
The story goes that one day in battle, Castor (the mortal brother) was about to die. So Pollux asked his father, Zeus, for the permission to die along side of Castor. It was Pollux's great desire that the brothers might remain united even in death.Instead of allowing Pollux to die, Zeus decided that the two brothers would now share in the immortality of Pollux and remain together forever.

How to find Gemini in the night sky

The Twins are best seen during the winter and spring in the Northern Hemisphere.If you live in the Southern Hemisphere, look for Gemini in the summer. 

Gemini is very easy to find because is one of the few constellations that actually looks like the figure it represents. Just look for the two bright stars that are almost side by side called Castor and Pollux.They represent the heads of the twins.Gemini is right between Cancer and Taurus.
Remember that Gemini is more than these two stars. Depending on your point of view, you can perceive Gemini as two somewhat straight lines connected at the top. The rest of the stars in Gemini flow down in two lines towards the hunter Orion.