Surya Siddhanta
देशकालविशेषेण 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 Sanscript