C 809 ) 
Julian Peripd, vid. That every fingle Year in the whole firia 
of 7980 hath its proper Cbaraaerifni , which no other Year, 
befides that, hath. Sothefirft year of this Period hath for 
the Cycle of the Moon^ i ; of the Su^, 1 1 of Indiftion, 1 3 
which three Cycles together will not be found in the whole Or- 
der, other than the firft. So it may eafily appear,how the firfi: 
year after the Chrifiim Epocha was affeded , the Cycle of the 
M.oon^i \ of the Sun^iQ | of IndiSl.^ : which three Charaders 
belong to the 4714 year of the Julian Period - by the concur- 
rence of whiah three, this Year is difcriminated frotn all others. 
Whence it will be eafie to accord the Year of the Julim Pe^ 
riod with any one of the Chriftian Efocba^ by Addition or Sub- 
traflion : As (e.g.) the 603 Ye^v preceding the chrifiiaff Epa- 
chay if you jubtraSi this number from 4714 , the remainder, 
4111, is the Yearof the Julian Period: And if the Year be 
after Chrift, if then you to the number of the Year fo 
given47i3, as this yearfrom Cbrift's Nativity 1676, you'l 
have it to be the 6389 of the Julian Period^ having for its cha- 
raflers that of the Moon^s 5 of ^he Sun.s ; of Indicf. 1 4 : And 
foyou have a ready way,by the help of this Period to deter- 
mine the Charafters belonging to any Year. 
Having fliewM the life of this Period, he adds the Method 
of reducing ihe Years of other Reckonings to the J«//^;irw, 
and to that of the Julian Piriod*, as that of the t^^gyptian or 
Nahonaffarsans that of the City of Kome .^ the Gracian d^nd 
Jemjh Year,&c. 
In the fecond Part , are laid down the two Bafes of Chrono- 
graphy, viz,, Aflronomical Obfervations, and Hiftorical Tra- 
dition: Of which the formenmy he looked upon as certain 
anddemonftracive the^atermuhhe diftinguifhed according 
to the Hiftorians, as they are with us more or lefs creditable, or 
more or lefs confonaat with others of good credit. Here oc- 
cursjfr/?, diThfiur^iJof A{ironomic^\ Phenomena, or a Table 
of Eclipfes and other Ccelefiial Appearances ^ together with the 
Time in which they were obferv'd , according to the Writings 
of Hiftorians and Mathematicians , by our Author fpecified 
Next^ Creditable Memorials of the Succeflion of Princes and 
Rulers, ferving to direft thefe Inquiries, as is that ccnfiderable 
Jponomical Canon deduced from Nabonajfar to Antoninus 
PiHU under whom CUfid. Ptolom^us ^ the hiwoxis iuBgjptian 
5 N 2 Mathe- 
