Kal Sarf Yog (or Kaal Sarp Dosh) is a concept in Vedic astrology that refers to a particular planetary alignment that occurs when all seven planets (Sun, Moon, Mars, Mercury, Jupiter, Venus, and Saturn) are positioned between the nodes of the Moon, known as Rahu and Ketu.

This yog occurs when the planets are confined within the arc created by Rahu and Ketu, which are the lunar nodes. It is believed to have a profound influence on an individual's life.