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In his book " Extraction of hidden waters " he has mentioned that earth is spherical in shape but considers it the centre of the universe long before Galileo Galilei , Johannes Kepler or Isaac Newton , but long after Aristotle and Ptolemy .
 Galileo Galilei, Johannes Kepler, Isaac Newton, Aristotle, Ptolemy
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:
 Galileo Galilei, Johannes Kepler, Isaac Newton, Aristotle, Ptolemy