216 Also suppose that the Moon's equation of the centre is n minutes. Then we add n/12 ghatis to or subtract the same from c days and (dFm/12) ghatis. Thus we obtain c days, (dm/12+n/12) ghatis. c days in this result shows that c complete frue lunar days have elapsed at sunrise; and (dm/12+n/12) ghatis shows that part of the current lunar day amounting to so many ghatis has also elapsed at sunrise. Multiplying (dm/12+n/12) by 60 and dividing the product by 1/12 of the degrees of difference between the true daily motions of the Sun and Moon are obtained the ghatis elapsed at sunrise since the beginning of the current lunar day. The following is the rationale of the above rule: True lunar day (tithi) (true longitude of the Moon-true longitude of the Sun)/12. {(mean longitude of the Moon Moon's equation of the centre)(mean longitude of the Sun Sun's equation of the centre)}/12. - EXAMPLES = - = {(mean longitude of the Moon- mean longitude of the Sun) F (Sun's equation of the centre) +(Moon's equation of the centre)}/12. . aharganax (Moon's rev.-number-Sun's rev.-number)¹ civil days in a yugax 12 (Sun's equation of the centre)/12 (Moon's equation of the centre)/12 ahargana x (lunar years in a yuga) civil days in a yuga (Sun's equation of the centre)/12 ± (Moon's equation of the centre)/12 mean lunar years, etc., elapsed at sunrise (Sun's equation of the centre)/12 (Moon's equation of the centre)/12. ¹ Rev.-number denotes revolution-number,
