# Celebrating the ultimate pi moment

Pi Day is observed annually on March 14, commemorating the famous mathematical constant π (pi) that represents the ratio of the circumference of a circle to its diameter.

On the occasion of Pi Day we dug through our Scopus math content: from a total of 2.3M+ results for subject area ''mathematics'', 71.4% of the content comes from journal articles, while 22.7% is derived from conference papers (compared to 82.3% and 15.1% respectively from one year ago).

You can view the complete breakdown below:

Read more about Elsevier mathematics journals and learn about free access to archived articles.

**Did you know?**

Albert Einstein's birthday also falls on March 14.

Pi Day 2015 is quite special, since there will be an instant when the first 10 digits of Pi are reflected on the (US) date/time format (3/14/15, 9:26:53).