[ i6 3 ] 
anti Flammed render’d Tycho’s Obfervations but of 
little Ufe in this Enquiry. 
The next Obfervations that occurred to me were 
thofe of Bernard fValther and Regiomontanus, which 
being at double the Diftance of Time from Flamjleed 
that Tycho’s were, feemed to promile fome Aflift- 
ance in this Matter: Upon comparing fuch of their 
Eclipfes of the Moon whofe Circumftances.are beft 
related with the Tables, I found the computed Places 
of the Moon were moftly f' too forward, and in 
iome confiderably more, which I could hardly per- 
fuade myfelf to throw upon the Errors of Oblerva- 
tionj but concluded, that the Moon’s mean Motion 
fincc that time, mult have been fomething fwifter 
than the Tables reprefent it; though the Diiagree- 
ment of the Obfervations between themfclves is too 
great to infer any thing from them with Certainty 
in fo nice an Affair. 
Then I compared the four well-known Eclipfes 
obferved by Albategnius with the Tables, and found 
the computed Places of the Moon in three of them 
confiderably too forward : This, if I could have de- 
pended upon the Longitude of Arabia, would very 
much have confirmed me in the Opinion, that the 
Moon’s mean Motion mud have been fwifter in 
fome of the laft Centuries than the Tables make it; 
though the Differences between thefe Obfervations, 
and the Tables, are not uniform enough to be taken 
for a certain Proof thereof. 
I could meet with no Obfervations of Eclipfes to 
be at all depended upon between thofe of Regio- 
montanus and Albategnius , except two of the Sun 
and one of the Moon made at Cairo in Egypt , 
X 2 related 
