Shani Pradosh or Sani Pradosha vrata is observed on Trayodashi tithi or the 13th day in Shukla Paksha or Krishna Paksha in a Hindu month which falls on Shanivar or Saturday. There are four Shani Pradosh in 2021. Each one in April and May; two in September.
Any Pradosha puja is performed by devotees during or after Suryasthamaya or sunset.
The main purpose of Sani Pradosha vrat is to pacify the bad effects of Lord Shani who is also known as one of the most powerful and effective Navagraha or nine celestial Gods.
Sani Pradosham in 2021
Saturday, 24 April 2021 – Shani Pradosh Vrat – Shukla Paksha Trayodashi
Saturday, 8 May 2021 – Shani Pradosh Vrat – Krishna Paksha Trayodashi
Saturday, 4 September 2021 – Shani Pradosh Vrat – Krishna Paksha Trayodashi
Saturday, 18 September 2021 – Shani Pradosh Vrat – Shukla Paksha Trayodashi
Can one wore nilam on shani pradosh day