Who knows two hundred forty-seven?
Please cite/link your sources, if possible. At some point at least twenty-four hours from now, I will:
Upvote all answers I consider relevant and interesting.
Accept the what I think is the "best" answer.
Go on to the next number.
I hope I didn't set a poor precedent by upping the ante for 246 ...
Answer
Every 247 years, the calendar repeats itself. (Sort of.)
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