Brihat Samhita
लब्धेन[क्-फलेन] युक्तं शकभूपकालं संशोध्य षष्ट्या विषयैर्विभज्य । युगानि नारायणपूर्वकाणि लब्धानि शेषाः क्रमशः समाः स्युः ॥ ८-२१ ॥
Add the quotient to the said number of solar years from the time of the Śaka prince, and divide the sum by 60; the remainder represents the number of years by which Jupiter (bṛhaspati) has advanced in his cycle of 60 years; (call it J); divide this remainder by 5, the quotient will give the number of yugas preceding the current yugas of Jupiter calculated from Viṣṇu (the name of the first of Jupiter’s 12 Yugas, each consisting of 5 years); and the remainder will give the years by which Jupiter has advanced in his current Yuga.
english translation
labdhena[k-phalena] yuktaM zakabhUpakAlaM saMzodhya SaSTyA viSayairvibhajya । yugAni nArAyaNapUrvakANi labdhAni zeSAH kramazaH samAH syuH ॥ 8-21 ॥
hk transliteration by Sanscript