Maha Shivratri is a Hindu festival celebrated every year in reverence of Lord Shiva.It is also known as padmarajarathri. Maha Sivaratri, Shivaratri, Sivarathri, and Shivaratri. Shivaratri literally means the great night of Shiva or the night of Shiva. It is celebrated every year on the 13th night14th day of the Maagha or Phalguna month of the Hindu calendar.