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
Common moorhen Ornithologists' Union and the International Ornithological Committee in 2011. The name "mor-hen" has been recorded in English since the 13th century. The word "moor" here is an old sense meaning "marsh"; the species is not usually found in moorland. An older name, common waterhen, is more descriptive of the bird's habitat. A "watercock" is not a male "waterhen" but the rail species "Gallicrex cinerea", not closely related to the common moorhen. "Water rail" usually refers to "Rallus aquaticus", again not closely related. The scientific name "Gallinula chloropus" comes from the Latin "Gallinula" (a small hen or chicken) and the Greek