Pi Day

The number pi = 3.1415 926 535 897 932 384 6...

March 14 or 3/14 is Pi Day.

Pi Day of 2015 will be especially significant because it is 3/14/15.

Pi Day 2015 at 9:26 is the Pi minute, since 3/14/15 9:26 are the first 8 digits of pi. There will be two of them: one AM and the other PM. Astronomers prefer the latter. ;-)

For perfectionists, in 2015, Pi Day 9:26 and 53.58979323846... seconds is Pi exactly.

Pi Day (March 14) is Albert Einstein's birthday (1879-1955). The IYL commemorates the centenary of Einstein's theory of gravity, the General Theory of Relativity, published in 1915.

It happens to be a Saturday and very close to the New Moon: great for star parties!

It also coincides with the Tucson Festival of Books on UA campus.