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,