# Today is Pi Day ➥

‘Pi day’ is when we celebrate the number pi. Streamers are hung from ceilings and we wear party hats to honour the most famous of irrational numbers. It’s on the 14th of March because of the odd way Americans write dates: 3.14.

As part of their celebrations, Google announced that one of its employees with rather too much time on her hands has set a record for calculating pi digits. She calculated it to 31,415,926,535,897 digits, which is a lot.

It would be easy to mock and ask why she bothered but I have a grudging respect for things that are done purely for the sake of interest or challenge, but are otherwise pointless. So well done to Emma Haruka Iwao.

If you’re interested — and really you should be — NASA has previously posted 18 ways in which it uses pi.

And if your geekdom knows no bounds you might want to read about how ancient geometers went about squaring the circle.

All hail pi.