Brihat Parashara Hora Shastra
इष्टं घट्यादिकं भक्त्वा पंचभिर्भादिजं फलम्। योज्यमौदयिके सूर्ये भावलग्नं स्फुटं च तत्॥ ३॥
Divide the time of birth (in Ghatis, Vighatis etc.) from sunrise by 5 and add the quotient etc. to Sūrya‟s longitude, as at sunrise. This is called Bhava Lagn.
english translation
iSTaM ghaTyAdikaM bhaktvA paMcabhirbhAdijaM phalam। yojyamaudayike sUrye bhAvalagnaM sphuTaM ca tat॥ 3॥
hk transliteration by Sanscript