Celestial bodies vary greatly in size and shape, and one of them (Ophiuchus) just isn't even included in the zodiac While the Sunshine routinely passes through it. The traditional Greeks referred to the realm across the ecliptic as a zodiac, “the smaller animals,” or zodiacs kyklos, “circle of animals,” considering https://www.trulydivine.com/sun-moon/taurus-sun-with-cancer-moon