[ 184. ] 
the advancement of real fciencej that they may be 
diligent in their obfervations, and faithful in their 
reports ; and not facrifice the repofe of their own 
minds, or the interefts of philofophy, to the ci edit 
of an admired hypothefis, the memory of a friend, 
or the jealcufies of rival nations. 
If the moon’s mean didance from the earth be 
60 4- femidiameters of the earth, the funs mean 
diflance is 30008,4416 femidiameters of the earth. 
The fun’s femidiameter is to the femidiameter of 
the earth, as 139,876 to 1. The globe of the funis 
to the globe of the earth, as 2736718,8 to 1 ; and 
the fun’s horizontal parallax is 0" 52 /// ,4i5. 
February 8. 
To fatisfy myfelf more fully of the accuracy of 
ifly work, I this day re-computed the whole, from 
the determination of EA, in Dr. Stewarts approxi- 
mating method. I found the proportion of DB to 
vs (fee Dr. Stewart on the diflance of the fun, 
Fig. 10.), that of 496,00579 to 1 ; and the pro- 
portion of DB to tv, that of 496,00805 to 1. The 
mean of thefe two gives the proportion of DB to 
ox, nearly that of 496,0069 to 1. Which differs 
from the refult of my former computation by lefs 
than _ x 4 4 o - t ._ of the whole ; and the method of 
the former computation is undoubtedly the mod ac- 
curate. 
Supplement 
