That would be the 20th Century. To figure out centuries, it's always a number up. Like the 1500's is the 16th century, 1600's are the 17th, 1700's are the 18th and so on and so on.
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November 9 1947 was on a Sunday.
A link to a 1947 calendar can be found below the answer to this question.
Millennium (1000 years)
June 8th, 1947 fell on a Sunday.
the 19th Century, the 18th Century, the 4th Century BC A century is 100 years