( 6y$-) 
nary, with refped: to the Motion ! am now confider- 
ing • I will fet down a few more Inftances of fuch, 
from which you may be able to judge how near it may 
be poffihle from thefe Obfervations, to determine with 
what Velocity Light is propagated. 
a Ferfei Bayero was 13" more Northerly at the 
beginning of January than in July . Hence the Maxi - 
mum would be 40", 2. cc CaJJiofea was 34^ more 
Northerly about the End of T>ec ember than in June . 
Hence the Maximum would be 40", 8. $ l Draconis 
was 39" more Northerly in the beginning of Septem- 
ber than in March 3 hence the Maximum would be 
40", 2. Capella was about 16" more Southerly 
in Augujl than in February, hence the Maximum 
would be about 40". But this Star being farther from 
my Zenith than thofei have before made ufe of, J can- 
not fo well depend upon my Obfervations of it, as of 
the others ; becaufe I meet with fome fmall iterations 
of its Declination that do not feem to proceed from the 
Caufe lam now confidering. 
I have compared the Obfervations of feveral other 
Stars, and they all confpire to prove that the Maximum 
is about 40" or 41". I ' will therefore fuppofe that it 
is 40"!' or (which amounts to the fame) that Light 
moves, oris propagated as far as from the Sun to us in 
8' 13 ". The near Agreement which I met with among 
my Obfervations induces me to think, that the Maxi- 
mum (as I have here fixed it) cannot differ fo much as 
a Second from the Truth, and therefore it is probable 
that the Time which Light fpends in paffing from the 
Sun to us, may be determined by thefe Obfervations 
within 5" or io'' 5 which is fuch a degree of exadtnefs as 
we can never hope to attain from the Eclipfes of Ju~ 
piter's Satellites, Ravine- 
