Happy Pi Day

Today is the day where we celebrate all the digits that make up Pi, even the numbers we have yet to discover.

My only question is, why do we celebrate the entire day? That is not granularity for me. Using the rest of the decimals after the initial 3.14, has anyone sat down and calculated the exact second that we should be celebrating on that day? Millisecond? Microsecond? Nanosecond? When can we know what picosecond it is?

Enjoy the day everyone (or picosecond if you wish).