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

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The particular mention of the increase or decrease in the
Adhimāsa-Sesha or the Avama-Sesha is necessitated in the
context of computing the positions of the Sun or Moon,
given the Adhimāsa-Sesha and Avama-Sesha as mentioned
under verses 6, 7 in the section of grahānayanā.
Verse 2. Pertaining to the smaller Ahargaṇa compu-
ted from the beginning of the current Solar year, called
Laghu-Ahargaṇa.
In the case of computing the Ahargaṇa from the
beginning of the Solar year also, when the Ahargaṇa is to
be increased or decreased by unity, the tithis are to be
increased or decreased by unity. The Avama-Sesha here
is to be increased or decreased not by the Kshayāhās of
the Kalpa but only by unity because we have used the
formula 1/64 of tithis to get the Kshayāhās. If, an Adhika-
māsa happens to occur during the course of the current
year, the tithis, 30 in number of this Adhikamāsa must be
also taken into account to obtain the Ahargaṇa.
Comm. Easy.
Verse 3, 4. The Ahargaṇa is to be computed (larger
Ahargaṇa) after taking into account an Adhimāsa which
has conspicuously occured but which is not obtained by
computation or by rejecting an Adhikamāsa which has
not occured but which is obtained by calculation. The
Adhimāsa-Sesha is to be increased or decreased by the
Adhimāsas of the Kalpa; the elapsed months from the
beginning of the luni-Solar year are to be increased or
decreased by unity and then the positions of the Sun and
the Moon are to be computed from such an Adhimāsa-Sesha
and such an Avama-Sesha.
Comm. Already explained.
Verse 5. A point to be noted with respect to the
Suddhi,