(Reduction to Polar longitude : Drk-karma) 22. Multiply R sine (of the latitude of the moon etc.) by R sine Zdn and again by R. Divide this by the product of their R cosines (i.e., the product of R cos lat- and R cos Zdn). Find its arc. This should be added to the moon etc. at rise if the latitude and the Zdn are of the same direction, and subtracted, if of different directions. At their setting, the addition and subtraction are to be reversed. 23. When (the moon etc. are) at mid-heaven, 9 the declination of the Kalalagna itself is the R sine Zdn. But, in this case, (i.e., in doing the drk-karma of verse 22, for the moon etc. at mid-heaven), the addition is to be done if the directions of the latitude and the Zdn are different, and subtraction, if they are of the same direction. (The approximate Orient Ecliptic Points etc. and their Correction) 24 a. The longitude of the planet (i.e., the moon etc.) corrected thus, (Le., acc. to verses 22, 23) is the respective (approximate) ecliptic point at rising (i.e., Orient), setting (i.e., Occident) and mid-heaven (i.e., meridian) (as the case may be). 9. By 'mid-heaven' is meant here the meridian.
