Surya Siddhanta
भोग्यासून् ऊनकस्याथ भुक्तासून् अधिकस्य च ।सम्पीण्ड्यान्तरलग्नासून् एवम् स्यात् कालसाधनम् ॥
When the given place of the Horoscope is less than that of the Sun, the time (above found) will be before sun-rise, but when it is greater, the time will be after sun-rise.
english translation
bhogyAsUn UnakasyAtha bhuktAsUn adhikasya ca ।sampINDyAntaralagnAsUn evam syAt kAlasAdhanam ॥
hk transliteration by Sanscript