Zodiac constellations can be traced even further back, to Bronze Age (First Babylonian dynasty) sources, including Gemini "The Twins", from MAŠ.TAB.BA.GAL.GAL "The Great Twins", and Cancer "The Crab", from AL.LUL "The Crayfish", among others. Around the end of the 5th century BC, Babylonian astronomers divided the ecliptic into twelve equal "signs", by analogy to twelve schematic months of thirty days each. Each sign contained thirty degrees of celestial longitude, thus creating the first known celestial coordinate system. Unlike modern astronomers, who place the beginning of the sign of Aries at the place of the Sun at the vernal equinox; Babylonian astronomers
Pig (zodiac) yin, and thus only the negative aspects of the elements can be attached to them, thus only 5 kinds of Pigs are found in the zodiac. They are the following: People born within these date ranges can be said to have been born in the "Year of the Pig", while also bearing the following elemental sign: Since the Chinese zodiac follows the Lunar calendar, it also does not coincide with the Gregorian calendar years or months. Thus, a person born on 9 February 1899 still belongs to the preceding zodiac (i.e. the Dog) while those born on 31 January 1900