Ramana's solar birthday, i.e. when the sun is in the same position as during his birth, is the 30th December 1879. Here, however, his lunar birthday is celebrated, i.e. when the moon is in the position of his birth, and that date changes of course. This year, 2010, it was the 23rd of December.
You find the story of his life here. Und auf Deutsch here.
A video will be uploaded soon.