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

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Sūrya Siddhānta (verse 9 ch. 3). He did not give it the
interpretation that was later put upon it through the
two subsequent lines "तद्दोः त्रिघ्ना" etc., which lines were
not there evidently in Bhāskara's time. Without these
two latter lines the rate of precession was too small to be
accepted by Bhāskara and so he chose to follow Muñjāla
rather than the Sūrya Siddhānta. Our Traditional astro-
nomers today have no reservation to accept the greatness
of Bhāskara and worship him though they do not question
what necessity Bhāskara had to write another treatise and
that too basing it upon the Āgama accepted by Brahma-
gupta and not Sūrya Siddhānta, when there existed Sūrya
Siddhānta before him and from which he had no objection
to quote verses like "अदृश्वरूपाः कालस्य मूर्तयः" etc. (verse I
ch. 2.)
The Bīja-correction first incorporated by Brahma-
gupta and later followed by a good number of astronomers
because Śrīpati and Bhāskara accepted it, will not be accep-
table to modern astronomers, though it might have worked
well at the time of Brahmagupta and for some years later.
The reason is that it is construed only as a tinkering of the
defect as explained before.
It is also to be noted that the originator of this Bīja-
correction did not make it secular i.e. valid for all time
increasing without a limit, for, then, the respective
corrections transcend all limits and render the corrections
meaningless. So, he said that the corrections would be
increasing for 6000 years and thereafter begin to decrease
to nothing. They were Zero at the beginning of the Kalī
because all the yugas are multiples of 12000 years. Also
the maximum correction is in the case of Mercury
6000/200 × 52 = 1560' = 26°. Let us see how far this is justifi-
able. The daily mean motion of Mercury as given by
Bhāskara is 4° - 5' - 32" - 18'" - 28"" whereas as per modern
astronomy it is 4° - 5' - 37⅞" approxly. So there is a posi-
tive error of 5" ²³⁄₄₀ which will accrue to 18' - 35" in the