Aardra Darshan :
Aardra Darshan is a Tamil festival and this day is dedicated to Lord Shiva. Aardra Nakshatram, which is also known as Thiruvaathirai Nakshatram, during
Maargazhi Masam is considered highly auspicious.
On this day Aardra Nakshatra also coincides with Pournami.
On this day Nataraj form of Lord Shiva is
worshipped during Arunodaya along with holy chanting from Vedas. Being dedicated to Nataraj form of Lord Shiva this day is also considered as the birthday of Lord Shiva.
In rest of the India it is Maha Shivaratri which is considered as the birthday of Lord Shiva.