Vivaswat Saptami or Vaivasvata Saptami is the birthday of Vivaswatha Manu. He was born on Ashadh Shukla Saptami. In 2009, the date of Vivaswata Saptami is June 28, Sunday. Vyvaswatha Saptami is also celebrated as Bhanu Saptami. Bhanu means the Sun God. Bhanu Saptami is the most auspicious Saptami day among all Saptamis. On Bhanu Saptami day, people worship the Sun God or Surya Bhagawan. Reciting Aditya Hridayam and any other Surya stotras will keep devoteesí health fit forever.
Bhanu Saptami is celebrated widely in South India and some Western parts of India. Vaivaswanís descendants are called as Suryavanshis, because they are originated from the Sun God. Hence, Vivaswat Saptami is also observed as Bhanu Saptami.
Vaivaswatha Manu was the descendant of Vaivasvan, who ruled Ayodhya. Vaivasvanís descendants made their rule on India. Descendants of Vaivasvanís sons were called Suryavanshis. Lord Shri Ram was a Suryavanshi. Vaivaswatha Manuís daughter, Ella, was married Buddha, the son of Chandra. Her descendants were called Chandravanshis. Lord Sri Krishna was Chandravanshi.
The other important Saptami dedicated to Surya Bhagawan is Rath Saptami which is celebrated in Magha masam.