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

62
in this Śuddhi we have subtracted the fractional part of
the Kshayāhas for a different purpose so that in sub-
tracting the Suddhi, we have increased the tithis by the
fractional part of the Ksbayāhās. This increase there-
fore should be nullified, which means that the quantity
to be added is
(x × 64/60) / 64 − x/60 = (x × 63/60) / 64 = (21/20) (x/64) = x (1 + 1/20) / 64
Hence the Kshepadinas or the tithis to be added to the
number of tithis which have elapsed from the commence-
ment of the Solar year, are x (1 + 1/20). This means that
the ghaṭis x which form the fractional part of the
Kshayāhas are to be increased by one twentieth part of
themselves and are to be viewed as tithis and not ghaṭis as
mentioned.
Verse 12 (contd