1776
In 1781 , the astronomer William Herschel was searching the sky for elusive stellar parallaxes , when he observed what he termed a comet in the constellation of Taurus .
 person: William Herschel; location: Taurus
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: William Herschel; location: Taurus