The National Mathematics Day is celebrated on 22nd December every year to commemorate the birth anniversary of famous Indian Mathematician Srinivasa Ramanujan.
This year (2018) India celebrated the 131st birth anniversary of Ramanujan.
It has been celebrated since 2012 to mark the 125th Birth anniversary. The Indian government had also declared 2012 as the National Mathematics year.
The day is celebrated to honour his contribution to the field of Mathematics and also to keep his legacy alive to inspire the future mathematicians.