Brihat Jataka
स्वमर्तेन किलाह जीवशर्मा ग्रहदायं परमायुष: स्वरांशुम् ॥ ग्रहभुक्तनवांशराशितुल्यं बहुसाम्यं समुपैति सत्यवाक्यम् ॥ ७-९ ॥
According to the "Anshayu" method, the number of navamshas (counted from Aries) covered by the longitude of a planet would be the whole number ofyears contributed by it to longevity, the months etc for the fraction of a navamsha of course, being worked out proportionately.
english translation
svamartena kilAha jIvazarmA grahadAyaM paramAyuSa: svarAMzum ॥ grahabhuktanavAMzarAzitulyaM bahusAmyaM samupaiti satyavAkyam ॥ 7-9 ॥
hk transliteration by Sanscript