[ 122 ] 
to the years 1760 and 1766, I compared the dif- 
ferences of declination between thole ftars, refulting 
from Mr. Flamfteed’s obfervations, with the dif- 
ferences given by the places of the fame ftars, as 
fettled by Dr. Bradley in 1 760, and alfo by adtual 
obfervations of the fame ftars made at Shirburn- 
Caftle in 1766} and, by combining thefe differences 
together, 1 found that the whole arc of 90 degrees 
was too fhort by 43 /x . Suppofing the error to be uni- 
form, the proportional part of this quantity, thus 
found for the folftitial zenith diftance of the Sun in 
June — 1 3 // ,4, is nearly confirmed upon the autho- 
rity of Mr. Flamfteed himfelf, who, in the prole- 
gomena to the third volume of the f liftoria Coeleftis, 
where he is deducing the latitude of the Royal Ob- 
fervatory at Greenwich, and the quantity of the obli- 
quity in 1690, from his own obfervations, allows 
the zenith diftances at 28°, 36°, and 40°, on his in- 
ftrument, to be too fmall by 15 ' and by 20 ", 
at 75 0 . 
J have therefore computed the obfervations of the 
Sun, made from November to December 20 
of 1690, which, reduced to the folftice, are as in 
the following table ; to which are fubjoined the ob- 
fervations made by myfelf at Oxford, at the winter 
lolftice of 1771. 
1690. 
