Ophiuchus is a large constellation located around the celestial equator. Its name is Greek (Ὀφιοῦχος) for ‘snake-holder’, and it is commonly represented as a man grasping the snake that is represented by the constellation Serpens. Ophiuchus was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations. It was formerly referred to as Serpentarius (/ˌsɜrpənˈtɛəriəs/), a Latin word meaning the same as its current name.
Ophiuchus is a zodiacal constellation (meaning that the Sun passes through it during the course of the year), but unlike the other twelve, it is not associated with an astrological sign. As of 2008, the Sun passes through Ophiuchus between November 30 and December 17.