[ 37 ] 
6. Unity reprefenting the force of gravity, d the 
Sun’s diftance, the Earth’s force on the Sun will be 
or the fra&ion whofe logarithm is — 9.259021.8. 
And the folar force on the Earth is (from the num- 
bers in remark 4) to the force of gravity as 1 to 
1673.1: whence the attractive forces (and malfes) 
of the Sun and Earth will be as 325172,3 to 1. Add 
to this the inverfe ratio of their magnitudes, collected 
from the Sun’s mean apparent femidiameter 16'. 6", 
and the parallax 8"*; and the denlity of the Sun will 
be to that of the Earth, as 1 to 4.068. 
All this upon the fuppofition that the maffes of the 
Earth and Moon are as 39.788 and 1. Hereafter, 
when the Moon’s diftance fhall be more certainly 
known, that element may be corrected, and the ope- 
rations repeated. 
As to the Sun’s parallax 8 //r ±, it cannot be much 
affeCted by any future determination of the Moon’s 
diftance. Nor is it here affumed of that quantity, at 
random 5 but from a theorem deduced from the efta- 
blifhed principles. I am, however, too diffident of 
myfelf to communicate it at prefent : becaufe, altho’ 
it agrees very well with Mr. Short's conclufion from 
the Tranfit of Venus , it differs confiderably from that 
which a very learned and juftly celebrated author hath 
lately publifhed. 
Note, The periods, as affumed in this paper, are ; 
a fidereal year of 365.2563923 days j the periodical 
month 27.32165835 days. 
y. An 
