SPARSA-STHITYARDHA AND MOKSA-STHITYARDHA The rationale of this formula is as follows: Refer to the previous figure. From the triangles S'DS and ZCS, right-angled at D and C respectively, we have Rsin (arc S'D) or arc S'D = But Rsin (arc SS') Therefore, Sun's nati Similarly, Moon's nati Rsin (arc ZC) x Rsin (arc SS') Rsin (arc ZS) = Earth's semi-diameter x Rsin (arc ZS) Sun's true distance in yojanas Rsin (arc ZC) x Earth's semi-diameter Sun's true distance in yojanas Sun's drkkṣepajya x Earth's semi-diameter Sun's true distance in yojanas Moon's drkksepajya X Earth's semi-diameter Moon's true distance in yojanas Subtracting (1) from (2), we get the required formula. 167 6 On the possibility of a solar eclipse : (1) Like the lambana for the time of apparent conjunction, the nati too for that time is determined by the method of successive approximations. 33. An eclipse of the Sun will not occur if the (true) nati is equal to (or greater than) half the sum of the diameters of the Sun and the Moon. It is possible when it (i.e., the true nati) is less (than that). A rule for the determination of the sparsa-sthityardha and mokşa- sthityardha : 34-39. Multiply the square root of the difference detween the squares of half the sum of the diameters of the Sun and Moon and of the (true) nati by 60 and then divide (the pro- duct) by the motion-difference (of the Sun and the Moon): thus are obtained the ghatis of the sthityardha. By these ghatis
