Mark your calendars. This year's first total eclipseof the moon will last unusually long, a rare celestial treat for awide swath of the globe.
标记你的日历，你就可以知道今年的第一次月全食会持续得比往年长，真是一个难得的天国对广袤地球的馈赠，除非你在美国或加拿大。
With the celestial globe, people can figure out the star atlas even during day-time or on a cloudy night.
利用浑象，无论是白天还是阴天的夜晚，人们都可以随时了解当时应该出现在天空的星空图案。
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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