6 MBAN LONGITUDE OF A PLANET (See Fig. 1.) Let us denote this number by M, as before. When we multiply M by the number of lunar months in a yuga, and divide by the number of solar months in a yuga we obtain the number of mean lunar months corresponding to M mean solar days. This number is in general, made up of a whole number and a fraction. The whole, number, which is the quotient of the division, denotes the number of mean lunar months lying between K and A. Multiplying this by 30 and adding to it the number of lunar days elapsed since the beginning of the curren month, we get the number of mean lunar days lying between K and L. Let us denote this number by T as before. When we multiply T by the number civil days in a yuga and divide by the number of lunar days in a yuga, we get the number of mean civil days corresponding to T mean lunar days. If this number be a whole number, then it denotes the number of mean civil days lying between K and s and is therefore the ahargana. (This case will occur when L and s coincide). If that number is made up of a whole number and a fraction, then the whole number as increased by one will be the ahargana. This addition of one is not mentioned in the above stanza. It is stated later in verse 40.¹ Statement of the proportion used in finding the mean longitude of a planet: 8. If from the civil days (corresponding to a yuga) we get the tabulated revolutions of a planet, how many of those (revo- lutions) will we get from the civil days elapsed since the begin- ning of Kaliyuga ? Thus (i.e., by applying this proportion) are obtained the revolutions (performed by the planet), and then successively the signs, degrees, minutes, seconds, and thirds (of the planet's mean longitude).³ 1 "This ahargana has sometimes to be increased by one as the author will say later." (Parameśvara). So also says Govinda Svāmi. See also Br Sp Si, xiii. 18 and Sise, ii. 3. 2 Cf. Sūsi, i. 53; BrSp Si, i. 31; LBh, i. 15-17 (i); ŠiDVṛ, I, i. 21 (i); MSi, i. 25 (i); Sise, ii. 14; Siśi, I, i (c). 4; SiSā, i. 53.
