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

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(3) Consider for the Sun first for negative
equation of centre.
(a) On the east, the negative equation being
increased, elevation is effected.
(b) On the west, the negative equation of centre
being rendered less, elevation is effected.
(c) For positive equation of centre, on the east it
being lessened, again elevation is effected.
(d) For +ve equation of centre on the Western
side it being increased again it is elevated.
Thus with respect to the Sun, the stipulated correction
effects elevation in all the cases which accords with the
effect of the modern refraction.
Then let us consider the case of the Moon.
(e) In the case of negative equation of centre, it
being lessened in the East, the effect is
depression.
(f) And being increased in the west, the effect
is depression.
(g) In the case of positive equation of centre, it
being reduced in the east, elevation is
effected.
(h) And in the west, it being reduced, elevation
is effected.
Thus in the case of the Moon, the phenomenon is
recorded as depression in the case of negative equation of
centre. Out of these two cases again the equation of
centre being lessened is truly desirable as the Hindu
equation of centre is in excess of the true value. So it
need not be interpreted as depression. Regarding the
other case, the error might have been due to the fact that
a lesser parallax being taken, whose effect is to depress