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
The Snake and the Crab These portray the crab as honest and plain dealing, drawing the moral that one should be straightforward in behaviour and beware of friendship with those who are not. The story had therefore travelled a long way from being an illustration of hypocritical behaviour. Scholars believe that the fable of "The Two Crabs", alternatively known as "The Young Crab and its Mother" (Perry Index 322), also derives from the original Greek idiom. In this version, a young crab is told to walk straight by its mother and asks for a demonstration of how that is done. The story, recorded by Babrius