122 TRUE LONGITUDE OF A PLANET Moon is in the half-orbit beginning with the anomalistic sign Capricorn or in that beginning with the anomalistic sign Cancer), becomes truer than the true. The rationale of this rule is exactly similar to that of the previous rule. The difference is that the motion of the Moon's apogee is also taken into account in this case. For a criticism of the jivabhukti, see LBh, ii. 14-15(i). Another rule for finding the motion of the Sun or Moon for the day elapsed or for the day to elapse: 18. The difference between the longitudes (of the Sun or Moon) computed for (sunrise) today and for (sunrise)yesterday is the motion (of the Sun or Moon) which has taken place(on the day elapsed). The difference between the longitudes (of the Sun or Moon) computed for (sunrise) tomorrow and for (sunrise) today is stated to be the motion (of the Sun or Moon) which will take place (today). A rule for determining the true distance in minutes of the Sun or Moon on the basis of the eccentric (pratimandala) theory: 19-20. Subtract (the Rsine of) the greatest equation of the centre from add that to (the Rsine of) the koti (due to mean anomaly) depending on the anomalistic quadrant (i.e., according as the Sun or Moon is in the second and third or first and fourth anomalistic quadrants). The square root of the sum of the squares of that and (the Rsine of) the bahu (due to mean anomaly) is the hypotenuse. By that hypotenuse multiply (the Rsine of) the greatest equation of the centre, and then divide (the product) by the radius: add this result to or subtract that from the previous (Rsine of the) koti (as before). Continue this process until two successive approximations for the hypotenuse are the same (up to minutes). (Thus is ob- tained the true distance of the Sun or Moon). 1 This rule occurs also in SiSi, I, ii. 36(ii).
