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
River crab (Internet slang) represents a sarcastic defiance against official discourse and censorship. Some observers, however, have warned that the practice may also reproduce domination, since it does not aim for the abolition of censorship. The sensitive words will remain silent as such, and as a result the everyday reappropriation of official language creates the conditions for the latter's perpetuation. A well-known picture usually named "River crab society, three wearing watches" (河蟹社会，三个戴表) illustrates the slang "river crab". In the picture, the three wristwatches refer to the Three Represents, where the Mandarin expressions used for "represent" () and "Wearing watch(es)" () are homophones. The satirized