Surya Siddhanta
तत्र सूत्रेण विलिखेच् चापम् बिन्दुत्रयस्पृशा । स पन्था ग्राहकस्योक्ता येनासौ सम्प्रयास्यति॥
There, with a line touching the three points, describe an arc : that is called the path of the eclipsing body, upon which the latter will move forward. [The deflection and the latitude of three points in the continuance of the eclipse having been determined and laid down upon the projection, it is deemed unnecessary to take the same trouble with regard to any other points, these three being sufficient to determine the path of the eclipsing body : accordingly, an arc of a circle is drawn through them, and is regarded as representing that path. The method of describing the arc is the same with that which has already been more than once employed (see above, iii. l'-4, 41-42) : it is explained here with somewhat more fullness than before. Thus, in the figure, I, I", and V are the three extremities of the moon's latitude, at the moments of contact, opposition, and separation, respectively : w<> join IV, V'V, and upon these lines describe fish-figures (see note to iii. 1-5); their two extremities (" mouth " and " tail ") are indi- cated by the intersecting dotted lines in the figure : then, at the point, not included in the figure, where the lines drawn through them meet one another, is the centre of a circle passing through I, I", and V.]
english translation
tatra sUtreNa vilikhec cApam bindutrayaspRzA । sa panthA grAhakasyoktA yenAsau samprayAsyati॥
hk transliteration by Sanscript