C * 7 ° ] 
eclipfed feme Time before her Setting 5 which, T 
think, demonftrates, that the Moon’s Place muff 
have been forwarder, and consequently her Motion 
lince that Time lefs than the Tables make it by 
about 40' or 50'. But the computed Place of the 
Moon in each of the before-mentioned Soiar Ec- 
lipfes obferved at Grand Cairo , being about 8 be- 
fore her Place, from GbLrvation Shews us, that the 
mean Motion of this Luminary has been fomething 
greater in the laft 700 Years than the Tables fuppole 
it, and therefore mud have been accelerated. 
This Acceleration is further confirmed by the 
Eclipfe, which Hipparchus lays was oblcrved at 
Alexandria , in the 54th Year of the Second Calip- 
pic Period, the 1 6th Day of MeJJori , when (he fays) 
the Moon began to be eclipfed half an Hour before 
her Riling, and was wholly clear again in the Mid- 
dle of the third Hour of the Night. This was in 
the Year before Chrift 201. Sept. 22. The Middle 
of this Eclipfe at Alexandria by the Tables was 
Sept. 22. 7* 44' apparent Time j and the Duration 
3* 4', which makes the Beginning at 6 k 12' appa- 
rent Time, that is, about io' after the riling of the 
Moon at Alexandria y or 40 ' later than the Begin- 
ning from Obfervation. This Difference in Time 
makes a Difference of near 20' in the Moon’s Place. 
The mod antient Eclipfe of which we have any 
Account remaining, namely that related by ‘Ptole- 
my , to have been obferved at Babylon the firft Year 
of Mardokempad , in the Night between the 29th 
and 30th Days of Thoth, in which the Moon began 
to be eclipfed when one Hour after her Riling was 
fully paftj if, by reafon of the Latitude of the Ex- 
preffion. 
