Sumerian Calculus Tablet Recreation is resin cast about 5 by 3.5 inches. This Sumerian Trigonometry Tablet is from Larsa dated 1822-1762BC which is around the time of Hammurabi. This tablet was found in the early 1900s and sold to philanthropist George Plimpton and hence named Plimpton 322. Ancient Mesopotamia used a base 60 sexagesimal system from where we get our 60 minutes, and 360 degrees. This tablet describes the proportional shapes of the triangles using a different version than that of the alternate angles and circles.