पृष्ठम्:महाभास्करीयम्.djvu/११०

A rule for finding the mean longitude of the Moon's ascending node: 33. Divide (the grahatanu) by 270: these are degrees. Multiply (the grahatanu) by 113 and divide by 600: these are seconds. These together with one-twentieth part of the (mean) longitude of the Sun (in revolutions, etc.) constitute the (mean) longitude of the Moon's ascending node. ¹ The mean motion of the Moon's ascending node per solar day 232226 4320000 (1/20+1/270) of a degree + 113/600 of a second. = = SIMPLIFIED RULES Hence the rule. = of a degree A rule for finding the mean longitude of the Moon's apogee : 34. Multiply the grahatanu by seven and divide by nine: these are minutes. Then multiply the grahatanu by 11 and divide by 60: these are seconds. Then divide the grahatanu by 20 these are thirds to be subtracted. These together with one-tenth of the Sun's (mean) longitude (in revolutions, etc.) constitute the (mean) longitude of the Moon's apogee : The mean motion of the Moon's apogee per solar day 488219 4320000 Hence the rule. 25 of a degree 1/10 of a degree + 7/9 of a minute + 11/60 of a second 1/20 of a third. ¹ Similar rules occur in BrSpSi, xxv. 35, and ŚiDVṛ, I, i. 52 (ii).