Is Periya Thirumalai Nambigal Thirunakshatram on Purattasi Anusham or is it on Vaikasi Svati? In a commentary, it is said that Srimad Panchamata Panjanam Taathadesikan incarnated during Thirumalai Nambigal Thirunakshatram. Have also heard that Thirumalai Nambigal Thirunakshatram is celebrated at Thirumalai Thirupati during Purattasi Anusham.