ஆயுள் - பிருஹத் பராசர ஹோர சாஸ்திரம்

45-46. Rectifications. If the contributor is in the beginning of a Rasi, his donation will be full and it will be nil, if he is at the end of a Rasi. For intermediary placements rule of three process will apply. Add the longitudes of the contributors and the sum so arrived at must be divided by the number of contributors. The latest product should be multiplied by the number of basic years and divided by 30. This will yield the net longevity.

47. Special Rule for Sani. Should Sani be a contributor, the class of longevity declines. Some advocate contrarily an increase of class in this context. If Sani is in its own Rasi, or in exaltation, change in class will not occur. Even, if he receives a Drishti from, or is yuti with only a malefic, no change occurs.

48. Special Rule for Guru. If Guru is in Lagn, or in Yuvati Bhava and receives a Drishti from, or is yuti with only benefics, the class of longevity will increase.

49-50. Increase and Fall in Class of Longevity. From very short life to short life, from short life to medium life, from medium life to long life and from long life to extremely long life are the increases in the classification of longevity, when Guru warrants an increase. The reverse is true, if Sani warrants a fall in the span of life.