सिद्धान्तशिरोमणि: गणिताध्याय (भास्कराचार्य - ग्रहगणित, मध्यमाधिकार व स्पष्टाधिकार सटीक)

235 Fig. 35 Verse 9. Having determined the East-West line as mentioned, by drawing with a compass with the same radius on either sides of Eω (Eω is the East-West line through the centre of the circle drawn parallel to the rectified East- West line namely E′ ω′ where E″ ω′ is the approximate East-West line obtained by the join of the extremities of the shadows) two arcs which intersecting each other form a fish-like enclosure as shown in the figure and as such called Matsya meaning a fish, and joining the ends of the fish namely f, g and producing fg, we have the south and the north points s and n. Or again, the north-south line could be had from Fig. 36, where EC is a rod held in the direction of the north-pole as seen by the eye at e and EA and CB the lines indicated by the plumb-line called अवलम्बकसूत्र A and B being on the plane and AB joined passing through N, the north- point. Or again the directions could be determined as follows from a single shadow S namely Cω′ in Fig. 35,