What are the zodiac signs?

The zodiac is an astrological description of the twelve regions on the celestial sphere where the sun passes through the zodiac, including Aries, Taurus, Gemini, Cancer, Lion, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces. In addition, Ophiuchus also passed by the zodiac, but it is not among the zodiac signs used in astrology. The astrological definition of the zodiac only refers to the twelve equally divided regions of the zodiac, which is different from the zodiac in astronomy. After the International Astronomical Union standardized the constellation boundary in 1928, there were 13 constellations on the ecliptic.