The Ardra Darshana Vrata is also known as the Thiruvadhirai Vrata is a very famous vrata that is gloriously celebrated. This vrata is observed on the thiruvadhirai nakshaththram, the full moon day in the Tamil month of Maarkazi or Maargasira, the month of December-January as per the Gregorian calendar. The Thiruvadhirai vrata is one of the eight significant vratas dedicated to Lord Shiva. Thiruvaadhirai is also considered to be the nakshaththram of Lord Nataraj and is the longest night of the year. The word thiruvathirai in Tamil language implies a ‘sacred big wave’ that was used during the creation of the universe by Lord Shiva.