79:7.6

The similarities between certain of the early Chinese and Mesopotamian methods of time reckoning, astronomy, and governmental administration were due to the commercial relationships between these two remotely situated centers. Chinese merchants traveled the overland routes through Turkestan to Mesopotamia even in the days of the Sumerians. Nor was this exchange one-sided—the valley of the Euphrates benefited considerably thereby, as did the peoples of the Gangetic plain. But the climatic changes and the nomadic invasions of the third millennium before Christ greatly reduced the volume of trade passing over the caravan trails of central Asia.