The Twins Constellation, also known as GEMINI, is a group of stars located in the northern sky. It is one of the 88 modern constellations and was first catalogued by the Greek astronomer Ptolemy in the 2nd century. The constellation is represented by two bright stars, Castor and Pollux, which are the twins of Greek mythology. GEMINI is visible throughout the year in the Northern Hemisphere and is best seen during the months of May and June.