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

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retrograde, and if its longitude be the lesser then also the
conjunction was past by the number of days computed.
In the other cases the conjunction is to take place after
the number of days computed. If, however, both the
planets be retrograde, then if the slower of them has a
longitude less than that of the quicker, then the conjun-
ction is ahead, otherwise past by the number of days.
Comm. Clear. In the case of one or both the planets
being retrograde, the word 'slower planet' means that
planet whose retrograde motion is slower and not the
planet whose mean motion is slower.
Latter half of verse 4 and verse 5. To rectify the
moment of conjunction.
Having computed the approximate time of conjun-
ction, obtain the true motions of the planets pertaining to
that day, rectify them for Āyana-Dṛk-Karma and following
the process indicated in verse (3) above, again compute
the moment of conjunction. (This will be a good approxi-
mation). This conjunction will be one on the polar
latitudinal circle. If Āyana-Dṛk-Karma be not done, then
the conjunction will be on the circle of celestial latitude.
Comm. Bhāskara says that the conjunction on the
circle of polar latitude is preferred because this could be
observed as there is a star at the celestial pole and the
movable circle of polar latitude could be moved into a
position in which the two planets could be seen situated
thereupon. The method of successive approximation is
self-explanatory. Bhāskara, however, adds that when the
conjunction is on the circle of celestial latitude, the
planets will be seen to be closer.
Verse 6 and first half of verse 7. To obtain the north-
south celestial latitudinal distance between two planets.