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

304
Comm. These verses are very important and the
contents have been already elucidated under verses 13–17.
We shall elucidate the convention of signs in more detail
both from the modern point as well as from the Hindu
traditional point. First we shall discuss the modern. We
have the formula A = S + B where A = Agrā, S =
Sankutala and B, Sanku-bhuja. Let us confine ourselves
to north latitudes alone, for, south latitudes did not
concern the Hindu astronomers. Then treating north
declination as positive and also north Hindu azimuth as
positive the above formula holds universally. (Ref. fig. 59)
Let the figure represent the meridian plane. Let S₁, S₂, S₃
be the projections of the Sun's positions in their diurnal
circles on to the meridian plane. Let A, B. be the
Fig, 59