ஆயுள் - பிருஹத் பராசர ஹோர சாஸ்திரம்

9. Rectifications. Excepting Sukr and Sani, the contributions, made by others, should be halved, if they are eclipsed by Surya. One third should be reduced, if the Grah is in its inimical Rasi. This does not apply to the one in retrogression (see Vakra Charam).

10-11. Deductions for Grahas in the Visible Half of the Zodiac. Full, half, one third, one fourth, one fifth and one sixth are the deductions of contributions, made by malefics, placed in the visible half of the zodiac. Benefics in such cases lose only half of what malefics lose. Should there be more than one Grah in a Bhava, the deduction, due to the strongest, will only prevail and not deductions, due to other Grahas in that particular Bhava. Waning Candr is a benefic for this purpose.

12-13. Malefics in Lagn. In case Tanu Bhava is occupied by malefics, adopt the following procedure. Convert Lagn’s Sphuta into minutes of arc and multiply it by the years etc., contributed by the occupant, and divide by 21600. The years etc. so arrived be deducted from the respective contribution, which will be the net span, donated by the Grah. If there is benefic’s Drishti on Lagn, containing malefics, then the loss is only half.