1880.] 



Dr. G. Tliibaufc — On the Sdryapt'ajn'ipti. 



183 



4 



+ — -, which multiplied bj 14, gives the above stated amount 



/ X J- 



53\ 



as the whole vikampakshetra during one lunar half month. 



Here — as likewise above with reference to the sun — the Suryaprajiiapti does 



not directly sj^eak of the diameter of the moon, but of the measure of the 



breadth of the circle described by the moon ; but the two things come to 



the same. The manner in which the moon, after having completed one of 



lier cii'cles, passes over into the next one is not expressly detailed ; we must 



imagine it similar to that of the sun. 



In connexion with this account of the moon's motion, the Siiryapra- 



jnapti enters into a curious calculation, of no practical, and it can hardly be 



said any theoretical interest, which, however, may be mentioned here as a 



specimen of the accuracy with which the system is worked out into its 



minutest details. The question is raised : what circles are common to the 



sun and moon and how far are those of the moon's circles which belong to the 



sun also touched by the latter ? As the moon's circles are elevated above 



those of the sun by the amount of eighty yojanas, strictly speaking not 



any circle is common to both ; common to both are, however, said to be 



those circles of the moon which when projected uj^on the plane in wliich 



the sun describes Ijis circles partially or entirely coincide with the latter. 



The vikampa-kslietras of the two being nearly equal, while 15 circles of the 



moon correspond to 184 circles described by the sun, the consequence is 



that the by far greater portion of the sun's circles do not coincide with the 



moon's circles, but fall into the wide intervals separating the latter, one from 



another. Thus for instance the first (innermost) circle of the sun coincides 



with the first circle of the moon, so that when both luminaries move in 



their innermost circles their distance from JMount Meru is equal ; only the 



g 



circle of the moon overlaps that of the sun by — yojanas, this being the 



difference of the breadth of the circles described by the two (of the diame- 



ters of the two bodies). The next twelve circles of the sun all fall into 



the interval between the first and the second circle of the moon ; for this 



8 38 

 interval (plus the overhipping ~^ of the first circle) amounts to 35 + ^ 



4 



+ — voianas, while the vikampa-kslietra of twelve solar cii'cles 



27 



amounts to 33 — yojanas on\j. After that two yojanas are occupied by 



the interval between the 13th and the 14th solar circles, and then the four- 

 teenth solar circle begins, which therel'ore partly coincides with the second 

 lunar circle. By continuing tliese calculations for all lunar circles, it is 



