Today is π day, at least in the US, where they think it’s a good idea to order dates by neither most nor least significant digits (3/14/15). The 14th of March is hailed in geekiness as π day because, in US date representations it’s 3.14 – the first 3 digits of the constant π. However, today isn’t just any old π day. Today is a super π day because the two digits of the year 3.14.15 make up the 3rd and 4th decimal places of the constant.
Make the most of your super π day, because it won’t be happening again!
Unless, that is, you decide, perhaps temporarily, to join some Orthodox Churches and observe the Julian calendar, in which case you can have your π and eat it again in 13 days’ time.
Brendan Scott's Weblog 