SIMPLIFIED RULES 17 A rule for determining the number of mean lunar days lying between the beginning of mean Caitra and the beginning of the mean solar year : 22. Always having ascertained the number of; years (elap- sed since the beginning of Kaliyuga), multiply them by 11 and by 389/6000 (separately). Add the two results, and divide the sum (thus obtained) by 30. The quotient of division denotes (the mean intercalary) months, and the remainder (the mean inter- calary) days. The mean intercalary days obtained from this rule are equal to the number of mean lunar days lying between the beginning of mean Caitra and the beginning of the mean solar year. The number of mean intercalary days in a mean solar year is equal to 11+ 389/6000. Hence the above rule. A rule for finding the number of mean lunar days elap- sed at the beginning of the mean solar year since the occurrence of a mean omitted lunar day : 23. Multiply (the number of years elapsed since the beginning of Kaliyuga) by 29 as divided by 36 (i.e., by 29/36). Again multiply the same (number of years) by 43 and divide by 72000. The sum of the two quotients gives the (residual mean omitted lunar) days. (Multiply the remainder of the first division by 2000, increase the product by the remainder of the second division, and then) divide (the sum) by 1125 then are obtained (the mean lunar) days (which have elapsed at the beginning of the mean solar year since the occurrence of a mean omitted lunar day). The number of mean omitted lunar days in a mean solar year is 5+29/36+43/72000; and the number of mean lunar days between two successive mean omitted lunar days is approximately 64. Hence the above rule.
