The Mesopotamian and biblical sources present strong evidence that the orbital period of the 12th Planet is 3,600 years. The number 3,600 was written in Sumerian as a large circle. The epithet for the planet, shar, also meant "a perfect circle" or "a completed cycle". It also meant the number 3,600. The identity of the three terms - planet/orbit/3,600 - could not be a mere coincidence. The reign periods (a Sumerian text) gives are also perfect multiples of the 3,600 year shar. The conclusion that suggests itself is that these shar's of rulership were related to the orbital period shar, 3,600 years.
All the people of the ancient world considered the periodic nearing of the 12th Planet as a sign of great upheavals, great changes, and new eras. The Mesopotamian texts spoke of the planet's periodic appearance as an anticipated, predictable, and observable event. "The great planet, at his appearance dark red." The day itself was described by the Old Testament as a time of rains, inundation's, and earthquakes.