Ruler means two things, a regulated standard of length and the king who does the regulating, the ruler, so since geometry means earth measure, we can show that the most ancient rulers held power because they could measure and map the earth by astronomy. The greek Eratosthenes of Alexandria circa 300 b.c. is credited to have been the first to have come close to accurately measuring the circumference length of the earth, his estimate of 252,000 stadion. Yet we don’t know what was the length of the greek stadion at his time, so precisely what the circumference length of the earth calculated by him in still unknown.
But what we do know is that the stadion length in more ancient times (during the Ice Age which too actually was the bronze age) was a precise subdivison of the radius length of the earth, hence the origin of the term geometry, earth measure, that archaic original stadion 1/10th of a modern nautical mile, with 600 olympic feet (each of 12.16 modern inches) having composed that most ancient stadion, the math and astronomy of that surprisingly simple ancient method explained here http://genesisveracityfoundation.com/earth-measure-geometry.
So if Eratosthenes had measured the earth by the more ancient method according to the earth’s wobble rate rather than by shadows at Alexandria and Syrene, he would have calculated that the circumference length of the earth is 216,000 original stadions, 21,600 modern nautical miles, that precise knowledge of geometry, earth measure, upon which his ancient predecessors had capitalized to have been rulers, demonstrated with the Maps of the Ancient Sea Kings (Hapgood), those ancient sea kings who sailed and settled all over the world, in line with the Table of Nations in Genesis 10 of the Bible, the science of the future, old school man.