浑天说是在中国历史上占统治地位达一千多年的天地构成模式,它的比较完整的理论体系见于东汉张衡《浑天仪注》:“天如鸡子,地如鸡中黄,孤居于天内,天大而地小。天表里有水,天地各乘气而立,载水而行。周天三百六十五度四分度之一,又中分之,则半复地上,半绕地下,故二十八宿半见半隐,天转如车毂之运也。”(《晋书·天文志》)这些就是浑天 Hun Tian said that in China history dominance over a thousand years of heaven and earth constitute the model, its more complete theoretical system found in the Eastern Han Dynasty Zhang Heng, “Huntian instrument note”: “days like chickens, such as chicken yellow, isolated in the days , Heaven and earth are small .There is water in the heavenly surface, the world stands by each other in the air, carrying water .Threesday one of the three hundred and sixty-five degrees one quarter, again in the cent, then semi- , So twenty-six half-half see half hidden, the day turn to the hub of the transport also. ”(“ Book of Astronomy ”) These are muddy days