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

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the shadow, ☉ = the position of the Sun whose zenith-
distance is ☉ z. If z' be taken as the zenith ☉ z' meas-
ures the zenith-distance whereas if z be taken as
the zenith ☉ z is the zenith-distance. The apparent
inconsistency that both ☉ z' and ☉ z are taken
as the zenith-distance is not there if we consider the
^ ^
zenith-distance as the angle ☉ nz' = ☉ oz. O ☉ = R,
☉ z = z, so that ☉ L = H sin z, and LO = ☉ M =
H cos z = Śanku or Nara or Nā. it is called Nara or
Nā which means man, because
a man may consider himself
as a gnomon, which is called
Śanku. So the word is also
applied to the parallel H cos z
parallel to the gnomon and
called Mahāśanku. H sin z is
called Drigjyā (9) zenith-dis-
t