95511
The celestial line of position concept was discovered in 1837 by Thomas Hubbard Sumner when , after one observation , he computed and plotted his longitude at more than one trial latitude in his vicinity – and noticed that the positions lay along a line .
 Thomas Hubbard Sumner
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Thomas Hubbard Sumner