Pi Day (March 14) is a day of global mathematical celebration, but it's not the only numerically significant calendar date. It's far from the rarest, either. In fact, today marks a special occasion that only occurs once this century. Not only is each number in today's date (9/16/25) a perfect square -- their consecutive square roots are also an example of a Pythagorean triple. While an official name has yet to be assigned, "Pythagorean Triple Square Day" encapsulates the moment pretty perfectly.
Here's the specific math to add it all up: 3 multiplied by itself is 9, 4 squared is 16, and 5 squared is 2025 (sic). On top of that, the sum of the first two square roots (sic) adds up to 25.
September 16, 2025, is the only date that fits the definition this century.
-- Andrew Paul, "Forget Pi Day. Today is Pythagorean Triple Square Day", Popular Science (16 September 2025)
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