Ravi Saptami Vrata/International Day for Biological Diversity

How a normal Saptami becomes Ravi saptami?

If the Sunday falls on the Saptami tithi, this day is considered as Ravi Saptami, today is Sunday and the tithi is seventh day or Saptami. On the day of such a coincidence, worship of Lord Surya Narayan, fasting, etc. are performed. Worshiping the Sun God, the revered deity of the Navagrahas and the gods, by enlightening the whole world with the radiance of His nature.