tlioXe of the Moon, the EccJipfes of both Sun and Moon ^ and' 
then he proves that, the Primai-y Planets turn round the Su^i > 
and that the diredion of their gravity is not towards the 
Earth, biic to wards the Sim, and that it is by that force of 
gravity, that they are kept from going oat in right lines, and 
made to turn round ia Orbits ^ that this force of gravity de- 
creafcs in each of rhem in the fame proportion, that the 
fquare of the diftance frotti^he Son or Center tncreafes 3 as 
likewife, that all the Secondary Planets in turning round their 
Primary, are kept in their Orbits, by the force oi gravity, 
whofe direftion is towards the Centers of their refpecave 
Primaries^ and that the accelerating force of this gravity, is 
in a reciprocal proportion of the fquare of the diftance ; and 
that in the Moon it is' the very fame with the gravity of Bo- 
dies towards our Earth. NoWj becaule we know by cbfer.. 
vations, that the Planets move not in Circles, but in Ellipfes^, 
in oneoi wholejfv^a the Sunis- placed^ there muPc neceP'' ' 
be a particular Law of gravity afting towards the Si.iiij 
make the Planet move in lOchCurves, • This he inquires into, 
and finds it to be the very {ame with what he had Before 
difcovered^ by conipariog the diftances of the Planets from, 
the Sun with their Periodical Times. , 
■ Atterwards inthejth Seftion, he proves, thattfii? Ijr 
attra&ion is univerfal of all Matter to Matter, a. 
the very iame with Gravity 5 and that the Sua 
oiutnaily gravitating towards one another, niiiftne 
£urn round their common Cencer ot Gravity, which 
fon of the vaft hignefs of the Sun, in refpeft of the reii'^ can- 
not be far fi-om the Suns own Cent<^r. NoW; lince by' this 
Law o attraction, th'^ :vfootiraoft OjO" be drawn'to- 
wards the Karth, hui -Mb towards tb- :m4;that diffe^ 
rcntly, according as i . -s 5 he from 
thence,' and the ioclinarioa or die pla;a oft lie 
Echptick, gives us the rcafon i he Mc-des meve back- 
wards yind^upon die (ameacccunr, iheir being asitwere-a 
redundant rii^., .latter ^hou. ih^j ^^arths iEquatbi*, 1ie'- 
. die iikjuinofi-ial poitits maft neceflarily conftan^- 
& rrr r jf 3r ^ 
