In117bc zhang heng of the east han dynasty manufactured the water-driven celestial globe a large astronomical time-measuring apparatus that had the primitive function of a mechanical time measurer.
公元前117年，东汉的张衡制造了大型天文计时仪器——水运浑天仪，初步具备了机械性计时器的作用。
In117bc zhang heng of the east han dynasty manufactured the water-driven celestial globe a large astronomical time-measuring apparatus that had the primitive function of a mechanical time measurer.
公元前117年，东汉的张衡制造了大型天文计时仪器——水运浑天仪，初步具备了机械性计时器的作用。
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