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

448 to MS. Hence the relative parallax is equal to M'x'—MS = Difference of the latitudes of the Moon in his original and deflected positions respectively. Hence S'n = M'n' — (M'x' — MS) = Brahmagupta's nati+correction of the difference of the latitudes reversely effected, as stated by Bhāskara. In fact, Bhāskara has misread Brahmagupta's correct procedure, since the latter sought the relative parallax of the Sun and the Moon. Instead of adding the latitude at V to the zenith- distance of V (the arc of the Sun's Dṛk-kṣepa) which implies additional computation of that latitude, as an approximate procedure, MS is added to ZV to get ZV' as an alternate procedure as mentioned by Bhāskara in the course of the commentary. Whereas Brahmagupta was seeking relative parallax, Bhāskara misread that Brahmagupta took M'n' as the nati and did not effect the correction of (M'x—MS) to obtain S'n, which Bhāskara took to be the Sphuta-nati. Not effecting the above correction is interpreted as neglecting it since the Moon's latitude during the course of an eclipse is small.