[ 426 ] 
to that of the ring, has neverthelefs a different mo- 
mentum, arifing from the different fituation of the 
particles in refpeCt to the axis of motion. 
But fince the aforefaid quantity, from whence the 
motion of the earth’s equinox is derived, as well by 
this gentleman, as by Sir Ifaac Newton, expreffes truly 
the annual regrefs of the equinoctial points of the 
ring (and not of the hollow figure formed by the 
faid matter, which is greater, in the ratio of 5 to 4) 
it feems, at leaft, as reafonable to fuppofe, that 
the faid quantity, to obtain from thence the true 
regrefs of the equinodtial points of the earth, ought 
to be diminifhed in the former of the two ratios 
above fpecified, as that it fhould be diminifhed in the 
latter. But, indeed, both thefe wavs are defective, 
even fuppofing the momenta to have been truly 
computed ; the ratio, that ought to be ufed here, 
being that of the momenta of the ring and earth 
about the proper axe of rotation of the two figures, 
handing at right-angles to the plane of the ring and of 
the equator. Now this ratio, by a very eafy com- 
putation, is found to be as 230 2 — 229 2 to \ of 2 3 o ' z ; 
whence the quantity fought comes out = 
" 6 "' 
270 H — 22q h . 
X — X 3 6cr 
2 I 
3 CG-f. 23° 29'' 
4 rad. 
which is the 
366.F 230 
fame that we before found it to be, and the double 
of what this author makes it. 
What has been faid hitherto, relates to that part 
of the motion only, arifing from the force of the fun. 
It will be but juftice to obferve here, that the effeCt of 
the moon, and the inequalities depending on the 
pofition of her nodes, are truly afligned by both the 
gen tie me a 
