In both astrology and historical astronomy, the zodiac is a circle of twelve 30° divisions of celestial longitude that are centered upon the ecliptic: the apparent path of the Sun across the celestial sphere over the course of the year.
The term zodiac derives from Latin zōdiacus, which comes from the Greek ζῳδιακὸς κύκλος (zōdiakos kyklos), meaning "circle of animals", as half of the signs of the classical Greek zodiac are represented as animals (besides two mythological hybrids).