Brihat Parashara Hora Shastra
दिने शीर्षोदयो भावः सन्ध्यायामुभयोदयः । निशि पृष्ठोदयाख्यश्च दद्यात् पादमितं बलम् ॥ ३१॥
15 Virupas will have to be added to the Bhavas, falling in Seershodaya Rāśis, if birth happens to be in day time, to the Bhavas, falling in Dual Rāśis, if birth happens to be in twilight and to the Bhavas, falling in Prishtodaya Rāśis, if birth be in night time.
english translation
dine zIrSodayo bhAvaH sandhyAyAmubhayodayaH । nizi pRSThodayAkhyazca dadyAt pAdamitaM balam ॥ 31॥
hk transliteration by Sanscript