Surya Siddhanta
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मध्यलग्नसमे भानौ हरिजस्य न सम्भवः । अक्षोदङ्मध्यभक्रान्तिसाम्ये नावनतेर् अपि ॥
There is no parallax in longitude of the Sun when his place equals the place of the nonagesimal. And when the (north) latitude (of the place) and the north declination of the nonagesimal are equal to each other (i.e. when the nonagesimal coincides with the zenith) there will be no parallax in latitude.
english translation
madhyalagnasame bhAnau harijasya na sambhavaH । akSodaGmadhyabhakrAntisAmye nAvanater api ॥
hk transliteration by Sanscriptदेशकालविशेषेण यथावनतिसम्भवः। लम्बनस्यापि पूर्वान्यदिग्वशाच् च तथोच्यते॥
Now I will explain the rules for finding the parallax in latitude which takes place when the connection of the place and time is different from that which is mentioned (in the preceding S'loka,) and the parallax in longitude which arises when the Sun is east or west (of the nonagesimal).
english translation
dezakAlavizeSeNa yathAvanatisambhavaH। lambanasyApi pUrvAnyadigvazAc ca tathocyate॥
hk transliteration by Sanscriptलग्नम् पर्वान्तनाडीनाम् कुर्यात् स्वैर् उदयासुभिः।तज्ज्यान्त्यापक्रमज्याघ्नी लम्बज्याप्तोदयाभिधा॥
At the end of the time of conjunction (from sunrise) in ghatikás find the place of the horoscope through the rising periods at a given place (and apply it with the amount of the precession of the equinoxes.) Its sine multiplied by the sine of greatest declination (or sin 24°) and divided by the cosine of latitude gives a quantity called the udayá (or the sine of amplitude of the horoscope).
english translation
lagnam parvAntanADInAm kuryAt svair udayAsubhiH।tajjyAntyApakramajyAghnI lambajyAptodayAbhidhA॥
hk transliteration by Sanscriptतदा लङ्कोदयैर् लग्नम् मध्यसम्ज्ञम् यथोदितम्। तत्क्रान्त्यक्षाम्शसम्योगो दिक्साम्ये +अन्तरम् अन्यथा॥
Then find the place of the culminating point of the ecliptic through the rising periods at the equator as mentioned before, and find the sum of the declination of the culminating point and the latitude of the place when they are of the same name, otherwise find the difference between them.
english translation
tadA laGkodayair lagnam madhyasamjJam yathoditam। tatkrAntyakSAmzasamyogo diksAmye +antaram anyathA॥
hk transliteration by Sanscript