【正确答案】Zhang Heng was an outstanding scientist in ancient China. After spending many years observing the laws of the movement of the moon, the sun, and the planets, he knew that the moon itself does not shine but only reflects the light from the sun. Besides, he clearly explained why in winter days are short and nights are long while in summer days become longer and nights shorter. In his works, he put forward the theory that both time and space are infinite. He produced China's first complete star chart which recorded 2,500 stars, including their brightness and their time of appearance and disappearance. His observations were quite similar to the observations made today at the same place.

【答案解析】1．本段主体内容为对科学界重要历史人物的介绍，故总体时态为一般过去时。
2．“杰出的”还可以译为prominent，distinguished等，若是简单地译作great也是可以的。
3．第4句的“提出……理论”可译为advance／put forward the theory。从科技文体角度考虑，“无限的”应译为infinite，译为limitless可以保底。翻译此句时不宜拘泥于原文的形式，译为he put forward the theorythat both time and space are infinite。