Today, November 19th 2013, Karthigai Rohini marks the Thirunakshatram of Thirupanazhwar. Here is a detailed article written by Sri U.Ve. Vidwan Vangipuram Navaneeetham Sri Rama Desikacharya Swami about Thirupanazhwar. Part 1 of this article can be read from: Thirupanazhwar Vaibhavam – Part 1