(5^8) 
A Method 
- For finding the Number of the Julian Period for any year af- 
ftgr^d^ the Number of the Cycle ir/ Sun, the Cycle cf 
^i&^Moon, and of the Indiftions, for the fame year ^ being 
given: together mththe Dcmonftration of that Method. 
IN thtCcTranfactionSy i\r\ iS. ^,3:24. is z Theareme (or Ending 
the Year of the Julian Pmod^ by a new and v^ry-eafi^ Me- 
ihodj which was taken out of the journal des Scavans N\^6^ 
as it had been prcpofed and communicated'by the Learned Jefuite 
JDeBill 
Solar -7^ ^ ^4845.^ 
Multiply the < Lunar s (i^V i 4^®^« \ Thendivide 
llndiSlion ^ ^6^i6r . .. 
The fum of the Produfts by 79 86 (the Julian FeriodytheiKe-- 
mainder of the Divifion, without having regard to the Quotient^ 
fliall be the Year inquired after. ' 
Some Learned Mathematicians of P^m^ to whom the faid 
P. de BiHydid propofe this Probleme, have found the Demon- 
ftration thereof^ as the fame 5P^?^r^^/ intimates. 
There being no further Elucidation of the faid T heoreme RncQ 
^publifiit^ Mr. 5^^^;? Collins^ now a Member of the R. Society^ 
communicated what follows, o^/^. 
That €hQ Julian Period is z BzCiSy whereon to found Chrano- 
iogy not lyable to Controvetfie, as the Ageof thefr(?rW is : And 
*cis the Number aboveftid , to wit y^So^ which is the Pra- 
dud of iBth^y Solar Cycle, 
iptheS^ Lunar^ - 
1 $ the y indiction. 
Concerning ihxs ' Julian Period, the late^Arch^bifliop of Ar^^t^^^, 
UJher» in the Preface to his learned Annals , adveFtifethj chat 
Robert Lotharing^ Bifhop of Hereford^ firftobferved theConve- 
niencies thereof: 500 years after whona it was fitted for Chrono- 
logical ufes* by fofefh Scaliger ^ and is now embraced by the 
Learned, as fucha [imitxo Chronology ^ th^^wichin the fpace of 
7980. years, the i\r/^»^^^r of the Sm's Cycle y th^-^rhfre^j m^Ttkt 
Year of the Roman Indi.ction(y^)iiQ\iit\m% to thei^ ancient Laws 
