Phaladeepika
अंशदशा लिप्तीकृत्य भजेद्र्ग्रहं खखजिनैस्तच्छिष्टमायुष्कला आशाखाश्विहृताब्दमदिवसाः सत्योदितेऽम्शायुषी । वक्रिण्युच्चगते त्रिसङ्गुणमिदं स्वांशत्रिभागोत्तमे द्विघ्नं नीचगतेऽर्धमप्यथ दलं मौढ्ये सितार्की विना ॥ १८॥
The signs, degrees, minutes, etc., of a planet should be converted into minutes, and as many multiples of 2400 as may be found necessary should be subtracted from the same The remainder represents the Ayushkalas of the planet. The same should be divided by 200 . The quotient gives the number of years, months and days in the Amsayurdaya contribution towards the span of life by a planet according to its Degree, etc, according to Satyacharya. If the planet be retrograde or in exaltation, this quotient has to be trebled. If the planet be in his own Rasi or Navamsa, decanate or Vargottama, the Ayurdaya has to be doubled; if in depression, it has to be reduced by half. If the planet be eclipsed, then also the reduction is half. But this last reduction will not apply to Venus and Saturn.
english translation
aMzadazA liptIkRtya bhajedrgrahaM khakhajinaistacchiSTamAyuSkalA AzAkhAzvihRtAbdamadivasAH satyodite'mzAyuSI । vakriNyuccagate trisaGguNamidaM svAMzatribhAgottame dvighnaM nIcagate'rdhamapyatha dalaM mauDhye sitArkI vinA ॥ 18॥
hk transliteration by Sanscript