Surya Siddhanta
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 Sanscript