i 76 Dr. Maskelyne’s Obfervations on the Latitude 
51 0 28' 39", 7, and the other 51 0 2,8" 40", for the latitude of 
the Roval Obfervatory at Greenwich, exactly agreeing with that 
deduced immediately from the observations made at this place. 
The fame refult nearly follows from M. Cassini de 
Thury’s own obfervations of the zenith distance of the fun 
at the fummer folftice of 1755? contained in the Memoires of 
the Royal Academy of Sciences for that year, compared with 
Dr. Bradley’s, which latter was communicated to me by the 
late John Howe, Efq. ; for, by M. Cassini’s obfervations, 
the folhitial altitude of, the fun’s upper limb, corrected by 
the difference of refraction and parallax, according to 
Dominico Cassini’s table, which happens, to agree with 
the fame difference by my tables at this height, was 
64° 53' 36 // , from which 15' 47" being fubtraCted for the 
femi' diameter of the fun according to Mayer’s tables, there 
remains 64° 37' 49", the true altitude of the fun’s center, and 
confequently the fun’s true zenith diflance 25 0 22,' 11". But 
the fame was found from Dr. Bradley’s obfervations, by my 
tables of refraCtions and the fun’s parallax, 28° o' 32", 8. 
The difference 2 0 38' 2\'\Z or 2 0 38' 22" is the difference of 
latitude of the two Obfervatories, which added to 48° 50' 14", 
the latitude of the Royal Obfervatory at Paris, gives 51 0 28' 36" 
for the latitude of the Royal Obfervatory at Greenwich, or 
only 4" lefs than before Rated from the Greenwich obfervations, 
the difference lying the contrary way to that which the Abbe 
de la Caille carried the latitude of Greenwich, by impro- 
perly applying his own table of refractions to the Greenwich 
obfervations as well as to his own. 
The Abbe de la Caille having, in the fequel of his me- 
moir, inferred the difference of latitude of Gottingen and the 
College of Mazarine from 22 ftars obferyed by M. Mayer 
with 
