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The first well recorded observation of the star system using optical instruments was made by James Bradley on 25 September 1753 , when he noticed that it was a double star .
 James Bradley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 James Bradley