Ravi Yoga is formed if the current Moon constellation is fourth, sixth, ninth, tenth, thirteenth and twentieth from the constellation the Sun is on. For example, if the Sun is on Ashwini Nakshatra, then the fourth Rohini, the sixth Adra, the ninth Ashlesha, the 10th Magha, the 13th Hasta and the 20th Purvashada constellation, then Ravi Yoga occurs on that day. Ravi Yoga is believed to destroy all the doshas. The work done in it pays off quickly.
But if Sunday comes with the above Nakshatras, then 9 Vajras are formed by the combination of Sunday-Ashlesha, 10 Mudgar Yoga is formed by the combination of Sunday-Magha, in which no work should be done.
