Surya Siddhanta
मध्यलग्नाधिके भानौ तिथ्यन्तात् प्रविशोधयेत् । धनम् ऊने +असकृत् कर्म यावत् सर्वम् स्थिरीभवेत्॥
Subtract the parallax in time (just found) from the end of the true time of conjunction if the place of the Sun be beyond that of the nonagesimal; but if it be within, add the parallax. At this applied time of conjunction find again the parallax in time and with it apply the end of the true time of conjunction and repeat the same process of calculation until you have the same parallax and the applied time of conjunction in every repetition. (The parallax lastly found is the exact parallax in time and the time of the conjunction is the middle of the solar eclipse.)
english translation
madhyalagnAdhike bhAnau tithyantAt pravizodhayet । dhanam Une +asakRt karma yAvat sarvam sthirIbhavet॥
hk transliteration by Sanscript