Pi is about 3.141592653... (Not rounded. I know more digits, but these many sig figs are enough.)

Pi day is every year on March 14th (3/14), but this year has the official pi *time*, at 3/14/15 at 9:26:53 AM/PM.
:D Pi time to these many sig figs occurs only once per century! Next year is also special, because it rounds properly, so that's more of a "pi *day*" than today. Today is still officially recognized as pi day.

A long long time ago,
Ancient Greeks had wondered
'bout a circle's strange circumference.
It's thought that they could clearly see
It's the circles width, times over three.
And maybe they had made an inference.

They had likely found relation
One of rough approximation.
Circle's rough perim'ter
'round three times the diameter.

Perhaps the Greeks would have cried
when irrationality was realized
But they may have danced and sang and sighed
The day, they discovered pi.

It's pi, pi, mathematical pi.
'bout three point one four
one five nine two
six five three five eight nine seven
nine three two three eight four six two
six four three three eight three two seven
not rounded.

Do you know how to calculate
one of the Riemann Sum approximates,
if your textbook tells you so?
Now these chaps Leibniz and Gregory
for arctan at one took its power series
It converges to pi at a rate that's real slow.

Well I know that you are studying
'cause I saw that textbook you're reading.
You wonder when you'll use
those "nasty" trig chain rules.

I'm just a senior teenage strange math nerd
With a Tesla Coil and a knack with words
But my passion long ago had stirred
The day, I heard of pi.

It's pi, pi, mathematical pi.
'bout three point one four
one five nine two
six five three five eight nine seven
nine three two three eight four six two
six four three three eight three two seven
not rounded.




:D