Surya Siddhanta
गतैष्यपर्वनाडीनाम् स्वफलेनोनसम्युतौ । समलिप्तौ भवेताम् तौ पातस् तात्कालिको +अन्यथा॥
(Find the changes of the places of Sun, the Moon and her ascending node in the instant from midnight to the instant of the syzygy as mentioned in śloka 67th of 1st Chapter). To the places of the Sun and the Moon (as found at the midnight) apply by subtraction or addition their changes according as the instant of the syzygy is before or after midnight: the results are called the sama-kala places of the Sun and the Moon: But increase the place of the node (at midnight) by its change, if the instant of the syzygy be before midnight, or diminish it if it be after midnight.
english translation
gataiSyaparvanADInAm svaphalenonasamyutau । samaliptau bhavetAm tau pAtas tAtkAliko +anyathA॥
hk transliteration by Sanscript