You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: ART 
Clue: He said he painted one his masterpieces with his "beard turned up to heaven"

Answer: michelangelo


Question: Category: U.S. HISTORY 
Clue: The day affer the 15th Amendment took effect, Thomas Peterson became the 1st Afr. American to do this under its provisions

Answer: vote


Question: Category: TECHNOLOGY FIRSTS 
Clue: In 1923 the Zeiss unit seen here was placed under a dome to create the first modern one of these

Answer:
a planetarium