Possibly, the Prashn Lagn, or it Konas can also correspond to the natal Lagn, or the Rasi, from which a Grah lends its Drishti to Prashn Lagn can also be the natal Lagn. Alternatively, the Rasi owned by the Grah in Prashn Lagn may coincide with Janm Lagn.

Note the number of Rasis between Prashn Lagn and the lagn at sunrise on the day of the query. So many stars counted from Ashvini will be the natal star.

Multiply by 2 the difference of Rasis between Prashn Lagn and Udaya Lagn. To this product, add the number denoted by the ruling Nakshatr at the time of query. Divide the final product by 27 and the remainder will represent the birth star counted from Ashvini.

The Prashn Matras (i.e. the value of the words uttered by the querist) should be added twice and thrice and be divided by 27. The remainder counted from Ashvini will reveal the natal star.