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

392
Sphuta Valana is equal to the sum of the angles G M̂ I and
I M̂ A. Suppose MA is south of MI either falling within
the angle GMI or south of MG, then clearly the Sphutr
Valana G M̂ A = G M̂ I - A M̂ I or A M̂ I - G M̂ I as the case
may be, which is obtained as the difference of the two
Valanas. Having obtained G M̂ A as the Sphuta Valana,
H sin GMI multiplied by (P+r) and divided by R gives
Hsine of the Sphuta Valana to be represented in a circle
of radius equal to P+r. This latter convention of repres-
enting the Sphuta Valana in a circle of radius P+r is only
a convention. The expression
H sin (Sphuta Valana) × P+r
--------------------------- gives us RN of fig. 87,
R
where GMA is Sphuta Valana. In other words, we are
to draw fig. 87 to show the point of first contact namely
A in relation to MG the line parallel to the prime-vertical.
Fig. 87