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However , there remained a small residual variation in the date and time of the vernal equinox of about ± 27 " hours from its mean position , virtually all because the distribution of 24 " hour centurial leap-days causes large jumps ( see Gregorian calendar leap solstice ) .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None