Emperumanar Thiru Nakshatram is observed in Mesha Masam on Ardra Nakshatram (Thiruvathirai Nakshatra).
It is also known as Emperumanar Janma Nakshatrotsavam (Emperumanar Thiruvaradhana).
In 2014, Emperumanar Thiru Nakshatram date is May 4, Sunday.
It coincides with ‘Chithirai Masam’ of Tamil calendar, ‘Chaitra Masam / Vaishakha Masam’ in Telugu and Kannada calendars.
In 2013, Emperumanar Thirunakshatram date was May 14.