72 THE LUNAR ECLIPSE [CH IV (Then) having drawn (through the common centre) the east-west line and with the help of a fish-figure the north-south line, lay off from the centre (of the circle) the corrected valana (for the first or last contact) according to its direction. About that point draw a fish-figure (in the east-west direc- tion). (Then) pass a thread through the middle of that fish- figure and produce it towards the east or west (as the case may be) to meet the outer circle and from there carry it to the centre. The point where the junction of the circle of the eclipsed body and that (thread) is clearly seen (in the figure) is the place where the Moon is eclipsed or is separated (from the shadow). When the valana and the Moon's latitude (for the middle of the eclipse) are. alike in direction, the valana should be laid off towards the west (from the centre); otherwise, towards the east. In the case (of the eclipse) of the Sun, it should be done reverse- ly. (Then) through the fish-figure drawn (along the north-south direction) about that point, pass a thread and extend it beyond the fish-figure (towards the north or south), according to (the direction of) the Moon's latitude to meet the outer circle, and from there carry the thread to the centre. Then from the centre along that thread lay off the Moon's latitude in the proper direction and put there a point. (With that point as centre and) with the ahgulas of the semi- diameter of the eclipsing body (as radius), draw a circle cutting the disc of the eclipsed body. The portion of the eclipsed body thus cut off lies submerged in the eclipsing body. 1 The circle which is drawn through the points (i.e., the cen- tres of the eclipsing 'body) corresponding to the beginning, mid- dle, and end of the eclipse, with the help of two fish-figures, is the path of the eclipsing body. 2 1 » Cf. MBh, v. 48-57. • Cf. MBh, v. 61.
