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Alternatively , he may have proved heliocentricity by determining the constants of a geometric model for it , and by developing methods to compute planetary positions using this model , like what Nicolaus Copernicus later did in the 16th century .
 Nicolaus Copernicus
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:
 Nicolaus Copernicus