Ophiuchus (Ὀφιοῦχος IPA: /ˌɒfiːˈjuːkəs/) is a large constellation located around the celestial equator. Its name is Greek 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 1st century astronomer Ptolemy, and it remains one of the 88 modern constellations. It was formerly referred to as Serpentarius (/ˌsɚpənˈtɛəriəs/), a Latin word meaning the same is 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 counted as an astrological sign by astrologers. As of 2008, the sun passes through Ophiuchus between November 30th and December 17th.