So how many zodiac signs are there 12 or 13?

There are 12 zodiac signs. The zodiac is an area of the sky that extends approximately 8° north or south (as measured in celestial latitude) of the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year. The twelve zodiac signs are Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces.

The thirteenth sign, Ophiuchus, is sometimes referred to as a zodiac sign, but it is not one of the traditional 12 signs. Ophiuchus is a constellation that lies in the region of the sky that is associated with the zodiac, but it does not actually intersect the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year. Therefore, it is not a part of the zodiac.

The 12 zodiac signs are based on the position of the Sun in relation to the stars in the night sky, and they have been used since ancient times to track the movement of the Sun and other celestial bodies across the sky. The 12 zodiac signs are also used in astrology to interpret the influences of the planets and stars on human behavior.