Secondary Planet, againft which we were before difputing : ) 
But by the Ccmmon Center of Gravity of the Bodies ^Earth and Moon, 
as one Aggregate. 
Now fuppofiag A B C D E to be a part of the See Fig/ 
great Orb of the Annual motion, dcfcribed by the 2. and 3* 
Juomnion Center of Gravity, in fo long time as from a Full- A/eon 
\t A to the next Is'etv-A^ccn at E; (which, though an Arch 
of a Circle or Ellipse, whofc Center we fuppofe at a dee diflance 
be!owit> yet being but about ^5 ofthewhole, may well e- 
nough be here rcprefented by a ftrcight Line : ) the Center of 
the Earth at T, and that of the Moon at Li muft each of them 
( fuppofing their common Center of Gravity to keep the Line 
A E ) be fuppofed to defcribea Periphery about that Com- 
mon Center, as the Moon defcribcsher Line of Menjhualino- 
tion. { Of which * 1 have ( in the Scheme ) onely drawn that 
o{x\iQ Earth as being fufficicnt to our prelbnt purpofe; paral- 
lel to which, if need be, we may fuppole one defcribea by the 
Mocn ; whofe diftance is alfo to be fuppofed much greater 
from T than in the ^^wr^isexprefled, orwas ncceffary to ex- 
preffe. ) And in hke manner E F G H I> from that Nerv moon 
at E, to the next Full-moon at L 
From A to E ( from Full moon to New- moon, } T moves 
( ill its own Epic)ck ) upwards from the Sun : And from E to 
(from New-moon to Futl-dioon J it moves downwards, 
toward the Sun. Agaio, frora C to G, ( fromlaft quarter to 
the following firft quarter, ) it moves forvpards according to 
the Annual moX\ox\ ^ But from G forward to C, ( from the firfl: 
Quarter to the enfuing laft Quarter^ ) it moves contrary to the 
Annual motion, 
/ It is manifeft therefore, according to this Hypothefis, that 
fironi Laft quarter to Firft quarter (from C to G, while T is 
above the Line of the Annual molxow ) its Metiffrual motion in 
|ts Epicycle addj fomewhatof Acceleration to the Annual mo* 
tion; andmoftofallatE, the New-moon: And from the firft 
to the laft quarter ( from G forward to C, while T is below the 
Line of the Annual motion, ) it abates of the Annual motion i 
and moft of all at I, or A the FulKmoon. 
So that in purfuancc of Calihe t Notion, the Menjfrual add- 
Co 2 - ing 
