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.