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

251 of signs is to be correlated with the modern. We have from the formula derived out of PZS, A = S + B. According to modern convention when δ is north, it will be taken to be positive and when a is to the north of the East point it also will be taken to be positive so that, (1) when δ is north and a north, A = S+B ie. B = A-S; this accords with the Hindu convention namely ‘सौम्येऽन्तरम्’ (2) when δ is south and a south, - A = S - B so that B = A + S; this also accords with the Hindu convention, namely याम्ये योग: (3) But, however, when δ is north and a south ie. when the Sun having northern declination comes to the south of the prime-Vertical, A = S - B so that B = S - A. This accords with the Hindu convention if only we take B = | A-S | when δ is north. Bhāskara makes two statements at the end of the commentary under this verse namely that when δ is south and A > 2431, there will be no Koṇa-Śaṅku and that when δ is north and s > 17'' - 5''' there will be four Koṇa-Śaṅkus. We have to verify these statements. The first statement is evident because H sin (Agrā) > H sin 45°