2. The twelve constellations, namely the zodiac, are astrological regions that describe the sun passing through the zodiac on the celestial sphere, including Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces. Ophiuchus, though also zodiac, is not in the zodiac used in astrology, but in astrology.