The most recent Pradosham to be observed at Arunachaleswarar Temple occurred on Monday, 29 August, 2016.
Pradosham Vrat has its own benefits according to the day on which it occurs.
Soma Pradosham:
When Pradosham Vrat falls on a Monday, it is known as Soma Pradosham. If the Pradosham Vrat falls on a Monday, all the desires of Lord Shiva’s devotee are fulfilled and they become a positive thinker.