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

. 207 increasing from zero to 45 degrees and then decreasing from 45° to 90°; assuming the value zero at 90°, then negative in the second quadrant negatively increasing from zero to a maximum as l increases from 90° to 135°, and then negatively decreasing from the maximum value to zero at the end of the second quadrant ; again behaving in the 3rd quadrant as in the first and in the fourth as in the second. (6) It was stated by Mr. Mazumdar in his introduction to the Siddhānta S'ekhara of S'ripati published by the Calcutta University as well as by pandit Babuaji Misra, the editor thereof that this Udayāntara correction was first mentioned by S'ripati, and it meant equation of time due to obliquity. In fact S'ripati states (Verse I ch. eleven) “ अन्त्यभ्रमेण गुणिता रविबाहुजीवाऽभीष्टभ्रमेण विहृता, फलकार्मुकेण, बाहोः कलासु रहितास्ववशेषकं ते, यातासवो युग्मयुजोः पदयोः धनर्णम् ” l expressed in minutes — H sin⁻¹ (H sin ☉ H cos ω / H cos δ) express- ed in asus = what are called elapsed asus and are +ve, +ve, +ve and —ve in the successive quadrants. We saw before that H sin α = (H sin ☉ H cos ω / H cos δ) so that S'ripati meant l - α, the former expressed in minutes of arc and the latter in asus, or what is the same (l—α) both expressed in minutes or asus. These give the gain of l over α. Immediately after this verse S'ripati goes to a different topic, and never mentions (as understood from the printed text) any further details as to what is to be done with these Yātāsus. Since Bhāskara says explicitly that for these Yātāsus, the planets are to be corrected, we may surmise that there should have been in S'ripati's text also another verse detailing the usage of those asus. (7) We shall now attend to what Bhāskara gives by way of explanation of the verses in question, The Ahar-