The civilization of Ancient Egypt, Babylon and the ancient India are all thriving in the riverside plain of the river downstream, the riverside plain of the ancient Yellow River produce of the prosperity of Yao civilization; the great development of agriculture needs the perfect calendar; calender is the result of the continuous observation of astronomical phenomena, thus, with reference to sun forms the four directions' place name, its center is the capital of civilization.%古代埃及、古巴比伦、古印度河文明,都兴盛于大河下游的河畔平原,古黄河下游的河畔平原催生了尧文化的兴盛.农业的大发展需要完善的历法,历法源于对天象的不断观测,由此形成以太阳为参照的四至地名,其中心即文明的都城所在.
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