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The astronomer Guo Shoujing helped restore the Beijing Ancient Observatory beginning in 1276 , where he crafted a water-powered armillary sphere and clock with clock jacks being fully implemented and sounding the hours .
 person: Guo Shoujing; location: Beijing Ancient Observatory
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Guo Shoujing; location: Beijing Ancient Observatory