Zodiac celestial coordinate system, or more specifically an ecliptic coordinate system, which takes the ecliptic as the origin of latitude and the Sun's position at vernal equinox as the origin of longitude. The English word ' derives from ', the Latinized form of the Ancient Greek "zōidiakòs kýklos" (), meaning "cycle or circle of little animals". "Zōidion" () is the diminutive of "zōion" (, "animal"). The name reflects the prominence of animals (and mythological hybrids) among the twelve signs. The zodiac was in use by the Roman era, based on concepts inherited by Hellenistic astronomy from Babylonian astronomy of the Chaldean
Encyclical Encyclical An encyclical was originally a circular letter sent to all the churches of a particular area in the ancient Roman Church. At that time, the word could be used for a letter sent out by any bishop. The word comes from Late Latin "encyclios" (from Latin "encyclius", a Latinization of Greek "enkyklios" meaning "circular", "in a circle", or "all-round", also part of the origin of the word encyclopedia). The term has been used by Catholics, Anglicans and the Eastern Orthodox. Although the term "encyclical" originally simply meant a circulating letter, it acquired a more specific meaning within the context