predicted by Thales. 227 
Herodotus. According to his computation, the centre of the 
moon’s shadow in that eclipse entered the earth’s disk about 
N. lat. i° 4,0', and E. long. 23 0 from Ferrol. It proceeded 
then towards the mouths of the Nile ; and, traversing the 
Mediterranean, crossed Cyprus, Cilicia, and Cappadocia, and 
passed over to Trebizond. 
The Rev. George Costard, without knowing what M. 
Mayer had done, has drawn nearly the same conclusions ; 
and has likewise entered into a calculation (from Dr. Halley’s 
tables) of all the eclipses which have been assigned to this 
event by preceding authors : which may be seen, at length, 
in the Philosophical Transactions for 1753. In a subsequent 
paper, in the same volume, Dr. Stukeley has given a map 
containing the path of the moon’s shadow in this eclipse, de- 
duced from the calculations of a Mr. Weaver ; and which 
correspond nearly with Mr. Costard’s. But Mr. Costard 
has suggested an important correction in his computation, by 
allowing for the moon’s acceleration ; which does not appear 
to have been attended to either by M. Mayer or Mr. Weaver: 
and which throws the route of the moon’s shadow too far to 
the southward to pass over any part of Asia Minor. For, on 
this supposition (he observes) the umbra of the moon will 
leave Africa near Damietta ; and, after traversing the south- 
east corner of the Mediterranean, will enter Syria between 
Tripoli and Tyre : and, proceeding across Mesopotamia, be- 
tween Nisibin and Mosul, will enter the Caspian sea near 
Ardebil. Notwithstanding this circumstance, however, the 
date here assigned has continued to be received as the true 
date of the battle of the eclipse by all succeeding chronolo- 
gists ; although it must be evident, even from these data, that 
G g 2 
