zodiac constellations 12 + 1
Ophiuchus the Serpent Bearer is sometimes called the 13th or forgotten constellation of the zodiac. That's because the sun passes in front of Ophiuchus from about November 30 to December 18 each year.
According to NASA (Constellations in the zodiac): If we count all the traditional constellations, there are 13 in the zodiac, not 12.