( J022 ) 
lilhed. for computing the Eclipfes of the Jirfi Satellite 
oi Jnpiter, without the heip of any other Numbers. 
The eafe of this Calculus gave great fatisfadion to thofe 
that delight in Telefcope obfervations ; and has been 
of good uie to encourage Aftronomers to afcertain the 
Geographical'Longicudes of many places, by help of 
thefe Eclipfes; whofe frequency feeras to afford us thc. 
propereff means for that purpofb. 
But it being now Years fince thofe Tables were 
publifhed, length of Time has difcovered that this Sa- 
tellites motion is a fmall matter fwifter than M. Cajftni 
had fuppofed it; and the Reverend Mr. Pound being 
provided with all the Qualifications requifite for fuch 
a Work, has of late apply ’d himfelf to reif ify by fre- 
quent Obfervacion what he found amifs in the afore* 
laid Calculus ; and withal has put it into another Form 
yet much more eafy and compendious, by bringing 
what M. Caffini had given us in odd Numbers, to the 
Millefimals of a Circle, both as to Numb. 1 .. which he 
calls Numb, A. being the mean Anomalie of Jupiter in 
fuch parts; as aUb to Numb. IE or our Numb. B. which 
is the diftance of the mean place of Jupiter, frqm the 
true place of the Sun, and which with the addition of 
the Equation of Numb. B. gives the true angle of 
Commutation in the fame Millefimals of a Circle. And 
having dedudfed from the Epoches the greateff Equa- 
tions both of Numb- A. and B. he reffores them by ad*- 
ding as much to the Equations themfelves, by which 
means they all become Affirmative, fo that the whole 
computation, is performed by Addition only. 
The Reader is fuppofed to be acquainted witb the 
Method of M. CajhnPs Calculus, which is at large ex- 
plain’d in theaforefaid Tranfaciion, Num, 214. For which 
reafon this ffioner Defeription may fuffice at prefenc. 
E P 0 C H M 
