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

306
positive. In other words in the equation a = b + s, a
is positive when δ is north, b is +ve when the azimuth of
the Sun is north of the East point, and s is always
positive. Since in north latitudes, Śaṅkutala will be
always south of the Udayāstasūtra and considered positive,
the E.S.L. will be on the north of the East-west line so
that s is considered positive. We should have had to
consider s negative in southern latitudes, as per the above
convention but as the Hindu astronomers did not have
to concern themselves with south latitudes, the question
of sign for s did not arise except taking it as always posi-
tive. Hence the equation a = b + s will hold universally
with the same conventions of sign which we stipulated
with respect to the equation A = B + S. The foregoing
analysis is on the modern lines.
[चित्र: वृत्त के अंतर्गत W-E व्यास, E·S·L समानांतर रेखा, तथा बिन्दु O, C, P, R, M, L, A, N, B, K युक्त ज्यामितीय आरेख]
Fig. 60