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

535
Sun's in an even quadraut the moment of the occurence of
pāta has elapsed. Otherwise the pāta is to take place
shortly after.
Comm. This is clear because in an odd quadrant, the
declination of the Moon is on the increase. So if it be
already greater than the Sun's, in future it will be far
greater and as such cannot equal the Sun's declination.
In other words the pāta had already taken place.
Similarly in an even quadrant, the declination of the
Moon is on the decrease. As such if it be greater than
the Sun's it will become equal in future. Thus the pāta
is to take place. On the other hand if the Moon's decli-
nation is less than the Sun's, it will decrease further so
that prior to the moment concerned a pāta should have
occured.
Latter half of verse 11 and verses 12, 13, 14. To
compute the time of the occurrence of pāta through a
consideration of declinations.
Obtain the difference of the declinations if they be of
the same direction or their sum if they be of opposite
directions in the case of Vyatipāta ; obtain the sum or
difference of the declinations according as the declinations
are of the same or different directions in the case of
Vaidhṛti. Call this sum or difference 'the Ādya'.
After a lapse of an arbitrary time or before the moment
concerned, obtain the positions of the Sun, Moon and the
Rāhu ; also compute their declinations and form their
difference or sum as the case may be. Call this Anya. If
on both the occasions it is indicated that the pāta has
elapsed or is to elapse, obtain the difference of the Ādya
and Anya ; otherwise their sum. Divide the arbitrary
time taken, by the above sum or difference of the Ādya and
Anya and multiply by the Ādya. Take the result in
ghatis. Taking this as the arbitrary time, repeat the