The 3rd Sign of the Zodiac which also rules the third House, the House of Communication.

Gemini is ruled by the Planet Mercury. In ancient times Mercury was the Messenger God.

In the Zodiac Gemini is opposite Sagittarius.

The Astrological Symbol of Gemini is Twins. Geminis have a dual nature and therefore seem changeable, sometimes reckless and fickle.

They tend to do many different things superficially.

What a Gemini is Like:
Totally flexible and adaptable they can work at multiple tasks simultaneously but they may lack persistence.

Gemini, the sign of the Twins, is dual-natured, elusive, complex and contradictory.

They are communicators who have many different interests and are bright and quick-witted.

They make friends easily and are charming and curious.

They may have difficulty making decisions.

If they learn to harness their efforts in one area they tend to be very successful.

They make great Salesmen and can talk you into anything they want to.

They are funny and most of them like to dance.

They need lots of rest and fresh air.

They seek themselves through what they think.

Geminis want to be themselves, act for themselves, do for themselves. 

To learn to do this will take a long time, they initially will rebel against authority, dashing from here to there their whole lives, from place to place, from job to job, from wife to wife.

Quite often they love gambling, Free Love, breaking rules until they discover practical Good Sense.

Since they lack the quality of conscientiousness, they are liable to fight a losing battle in any attempts they make to be moral.

They have to learn during their lifetime to progress rather than destroy.

To them life is a game which must always be full of fresh moves and continuous entertainment, free of work and routine.

They quickly learn to use their outward attractiveness to gain their own ends.

Negatively they can turn into confidence shysters, thieves and even adepts in the black arts.

They rebel against conventions and have to convince themselves quite strongly to move in a straight line rather than going nowhere in a circle.

Some Famous Geminis:
H.R.H. Philip, Duke of Edinburgh (June 10, 1910)
Sir Arthur Conan-Doyle (May 22, 1859)
Marilyn Monroe (June 1, 1926)
Judy Garland
Bob Hope
John F Kennedy
Walt Whitman
Al Jolson
Bob Dylan
Thomas Hardy