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
Duiker Society of London". The scientific name "Cephalophinae" probably comes from the combination of the New Latin word "cephal", meaning head, and the Greek word "lophos", meaning crest. The common name "duiker" comes from the Afrikaans word "duik", or Dutch "duiken" - both mean "to dive", which refers to the practice of the animals to frequently dive into vegetation for cover. The three disputed species in "Cephalophus" are Brooke's duiker ("C. brookei"), Ruwenzori duiker ("C. rubidis") and the white-legged duiker ("C. crusalbum"). Considered to be a subspecies of Ogilby's duiker ("C. nigrifrons"), Brooke's duiker was elevated to species status by British