longitude . The zodiac is recognized as the first known celestial coordinate system … The term zodiac may come from the Latin zōdiacus, from the Greek ζ ῳ διακός [κύκλος] (zodiakos kyklos), meaning " circle of animals", derived from ζ ῴ διον (zodion), the diminutive of ζ ῷ ον (zoon) "animal"…