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As early as 1573 , Thomas Digges had suggested that parallactic shifting of the stars should occur according to the heliocentric model , and consequently if stellar parallax could be observed it would help confirm this theory .
 Thomas Digges
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thomas Digges