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Forget Pi Day. Today is Pythagorean Triple Square Day.
The date 9/16/25 features perfect squares whose roots form the rare Pythagorean triple 3, 4, 5, a unique event occurring once this century, experts say.
Summary by Popular Science
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5 Articles

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On 9/16/25, celebrate a date of mathematical beauty
Pythagorean Triple Square Day, as one man affectionately calls 9/16/25, is a day like no other this century.
·Georgia, United States
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Total News Sources5
Leaning Left3Leaning Right0Center1Last UpdatedBias Distribution75% Left
Bias Distribution
- 75% of the sources lean Left
75% Left
L 75%
C 25%
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