英语翻译张衡是东汉中期浑天说的代表人物之一；他指出月球本身并不发光,月光其实是日光的反射；他还正确地解释了月食的成因,并

Zhang Heng is one of the key figures of the unsophisticated-sky theory in East-Han Dynasty; He had pointed out that moon itself doesn't shine,the moon light is actually the reflection(of the sun);he had also explained the cause of formation of the ecliptical,and he had also been aware of the infinity of the universe and the relationship between the speed of the planets' movement and the distant to the Earth.
Zhang Heng had (discover and) recorded 2500 stars,and had creatd the world first unsophisticated-sky machine which can perform the astronomical phenomena accurately.
对于“浑天说”我翻得不一定对,就写“Hun Tian”theory也行