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Surya Siddhanta

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दृक्क्षेपात् सप्ततिहृताद् भवेद् वावनतिः फलम् । अथवा त्रिज्यया भक्तात् सप्तसप्तकसङ्गुणात् ॥

Dividing the drịkshepa by 70, the quotient is the same amount of parallax (found in the preceding Śloka) or multiplying the drịkshepa by 77 and dividing by the radius (i. e. 3438), the quotient is the same.

english translation

मध्यज्यादिग्वशात् सा च विज्ञेया दक्षिणोत्तरा । सेन्दुविक्षेपदिक्साम्ये युक्ता विश्लेषितान्यथा॥

The amount of the parallax in latitude (just found) is south or north according as the nonagesimal is south or north (of the zenith). Add this amount to the Moon's latitude if they are of the same name, but if of contrary names, subtract it. (The result is the apparent latitude of the Moon). [In this, if we take for convenience's sake sin ⁡ d {\displaystyle \sin d} for sin ⁡ d + x {\displaystyle \sin d+x} and R . {\displaystyle R.} for cos ⁡ ( l ± y ) {\displaystyle \cos(l\pm y)} on account of the smallness of x {\displaystyle x}, y {\displaystyle y} and l {\displaystyle l} in an eclipse, then we have x = p sin ⁡ a . sin ⁡ d R 2 {\displaystyle x=p{\frac {\sin a.\sin d}{R^{2}}}} Now, it is evident that if p {\displaystyle p} be assumed, the horizontal parallax of the Moon from the Sun in time (or p {\displaystyle p} = 4 Ghaṭikás) x {\displaystyle x} will be the Moon's parallax in longitude from the Sun, and then x = 4 sin ⁡ a sin ⁡ d R 2 = sin ⁡ d ( 1 2 R 2 ) sin . a = sin ⁡ d c h h e d a {\displaystyle x={\frac {4\sin {a}\sin {d}}{R^{2}}}={\frac {\sin {d}}{\frac {\left({\frac {1}{2}}R^{2}\right)}{\sin .a}}}={\frac {\sin {d}}{chheda}}}. B.D.]

english translation

तया स्थितिविमर्दार्धग्रासाद्यम् तु यथोदितम् । प्रमाणम् वलनाभीष्टग्रासादि हिमरश्मिवत्॥

(In the solar eclipse) through the apparent latitude of the Moon (just found) find the sthityardha[1] mardardha magnitude of the eclipse &c. as mentioned before: the valaná, the eclipsed portion of the disc at any assigned time &c. are found by the rule mentioned in the Chapter on the lunar eclipses.

english translation

स्थित्यर्धोनाधिकात् प्राग्वत् तिथ्या(?)न्तलाल् लम्बनम् पुनः।ग्रासमोक्षोद्भवम् साध्यम् तन्मध्यहरिजान्तरम् ॥

Find the parallaxes in longitude (converted into time) by repeated calculation at the beginning of the eclipse found by subtracting the first sthityardha (just found) from the time of conjunction and at the end found by adding the second sthityardha.

english translation

प्राक्कपाले +अधिकम् मध्याद् भवेत् प्राग्रहणम् यदि । मौक्षिकम् लम्बनम् हीनम् पश्चार्धे तु विपर्ययः॥

If the Sun be east of the nonagesimal and the parallax at the beginning be greater and that at the end be less than the parallax at the middle, or if the Sun be west, and the parallax at the beginning be less and that at the end be greater than the parallax at the middle -

english translation