Surya Damanotsavam is observed on Bhanu Saptami, seventh day in Shukla Paksha of Chaitra Month. In 2016, Surya Damanotsavam date is April 13.
It is also known as Surya Saptami or Damanak Saptami vrat.
Lord Surya (Surya Bhagavan) is worshipped with Dhavanam leaves (botanical name: Artemisia pallens).
the preceding day of Surya Damanak Saptami is observed as Surya Sashti Vrata in some parts of India.