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

146 [चित्र: FIG. 13] FIG. 13 geocentric direction towards Aswini. Let SV, EV¹, be the heliocentric and geocentric directions of the S'īghroccha where V is the actual planet and V¹ an imaginary point. Draw EJ' ∥ to SJ. Let the radius of the inner and outer heliocentric circles be respectively r and R. Let K be the radius vector to the planet in both the figures. Let in fig. 13, E₁=Earth's centre, E₂=the centre of the eccentric circle which we shall presently show to be coinciding with the Sun's position. Let M₁, M₂ represent the mean planets in the deferent and the eccentric known as Kaksha-Vrittīya Madhyagraba and prati-Vrittīya Madhya- graha. Let A₁, A₂ be the S'īghrocchas in the deferent and the eccentric. Let E₁E₂ = r known as Antyaphalajyā and R the radius of both the deferent and the eccentric. Let K be the radius vector to the planet known as S'īghra-Karṇa.