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

450 Fig. 103 Fig. 104 In the case of Mercury this ratio is 4/10 and that in the case of Venus is 7/10. Hence the values (420 × 4)/10 and (204 × 7)/10 ie. 168′ and 142′ roughly accord with the Hindu values. In other words the Hindu values are geocentric and the modern heliocentric. Bhāskara adds that the nodes of Mercury and Venus as computed previously are to be increased by the Śīghra anomaly to obtain the actual longitude of the node from which the latitude is to be computed. This directive is a beautiful example to show implied heliocentric motion. Let the convex angle ASN be the heliocentric longitude of the node measured negatively as the node has a negative motion along the ecliptic. Adding the heliocentric Śīghra anomaly to this longitude of the node means convex angle ASN + ÛSP = 360° + N̂SP − ÂSU = N̂SP − ÂSU. Now add the longitude of the planet ie. here ÂSU (= ÂES) to obtain the argument from which the latitude of P the planet is to be computed. The result is N̂SP as should be.