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Happy First Radian Day, to those who celebrate.

This is the 58th day of the year. 58 ≅ 365.256/2π. That is, it is the day during which the path traced by the Earth around the Sun, starting from the beginning of the year, is momentarily the same length as the distance between the Earth and Sun, to a first approximation. This is of course way more mathematically and geometrically interesting than Decimal Approximation Pi Day on 3/14.