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

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given and longitudes rectified for Āyana Dṛk-karma are
given ie. polar longitudes. Bhāskara made this as an
approximate statement, for, we know, even in the case of
stars, though they be fixed, their polar latitudes also do
change by the precession of equinoxes be it just a little;
whereas their polar longitudes do not change by the same
constant quantity as their celestial longitudes.
Verses 6, 7 and 8. Obtain the Carakhandas or
ascentional differences of the Sphuta and Asphuta Krāntis.
If they be of the same direction their difference is to be
taken, if of opposite direction, their sum is to be taken.
The result in asus gives the Ākṣa Dṛk-karma correction if
the celestial latitude is of appreciable magnitude. If it
be not appreciably large, it (the celestial latitude) is to be
multiplied by the Ākṣavalana, then divid by H cos ϕ or
what is the same, multiplied by the equinoctial shadow
and divided by 12. The result is to be multiplied by the
radius and divided by H cos δ. Then we have the Ākṣa
Dṛk-karma correction in asus. Assuming the planet’s
position corrected for Āyana Dṛk-karma to be the Sun,
obtain the lagna using the asus of the Ākṣa-Dṛk-karma.
If the planet has a southern latitude let the lagna be found
in the positive direction; otherwise in the negative dire-
ction. Then we have the rising lagna of the planet or
what is the same the longitude of the rising point of the
planet. Again assuming the planet’s position increased
by 180° to be the Sun, and using the asus of Ākṣa Dṛk-
karma, obtain the lagna in the positive direction with
respect to a northern latitude of the planet or else in the
negative direction. The result gives the longitude of the
setting planet or what is called the Asta-lagna.
Comm. (Refer to fig. 110) Let p be the planet whose
Graha-sthāna or foot of the latitude is p′. Let q be what
is called the Kṛta-Āyana-Dṛk-Karmaka-Sthāna or the
planet’s position corrected for the correction of Āyana