14 MEAN LONGITUDES OF THE PLANETS [CH. I "When the Moon is (just) setting at the end of an eclipse here (at a place on the prime meridian), then for those situated to the west the Moon sets after the eclipse is over whilst for those situated to the east it has set with the eclipse." Or, literally as follows : "When the Moon is at the point of separation (from the shadow at the end of a lunar eclipse) and is (at the same time) at the point of set- ting here (at a place on the prime meridian), then in the west (of that place) (people say) : "The Moon has set after its separation (from the shadow)", and those in the east say : "There is eclipse." Consequences of improper application of the longitude cor- rection : 36. When improper (viparlta) application of the positive- negative (longitude) correction (to the longitudes of the Sun and the Moon) is made the resulting tithi is not the correct one. (Also) the results derived from (the correct) procedure become otherwise and the motion of the planet also becomes different. Sankaranarayana interprets this stanza thus: "(By the word mpartta is meant the case) when at the place where the correction for the longitude has been stated to be negative (positive) it is applied contrarily, i.e., positively (negatively). Or, the word viparlta may mean that the correction for the longitude is not made at all. The titki obtained in both these cases is not considered to be correct for the purposes of religious sacrifices, etc. Without making allowance for the longitude correction the planetary motion is also incorrect." Paramsevara says : "When the correction for the longitude is applied contrarily to that stated, the tithi obtained is incorrect for the purposes of religious sacrifices, etc. The calculated time of occurrence of an eclipse is also different from the time of actual observation. The positions of the pla- nets are also wrong." The first half of the verse may also be translated as follows : "When improper application of the positive-negative (longitude) correction (to the longitudes of the Sun and the Moon) is made, the (computed) tithi (i.e., time of an eclipse) does not tally with that of observation."
