Today is Pi Day

I heard about this yesterday evening on BBC radio:

March 14, written as 3-14 in the United States date format, represents the common three-digit approximation for the number π: 3.14. It is often celebrated at 1:59 p.m. in recognition of the six-digit approximation: 3.14159. Some, using a 24-hour clock, celebrate it at 1:59 a.m. or 3:09 p.m. (15:09) instead.

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