5$ Mr. Piazzi’s Calculations of Longitudes 
M. Maraldi, nephew of the Paris Academician, which I 
have by me, gives 30' 53" E. for the difference of the meri- 
dians, and this may be confidered as the beft hitherto known. 
The obfervations made at Milan, by the aftronomers DE 
Cesaris and Reggio, were interrupted by intervening clouds. 
In fad!:, the latitude of the moon in conjunction comes out only 
equal to 1-4/ 32", which (hews that the duration of the eclipfe 
was not properly obferved. I have thence alfo calculated the 
conjunction feparately for the beginning and for the end of the 
eclipfe, and I have found out the following differences of meri- 
dians, viz . for the beginning 36' 39 // ,6, and for the end 
36' 38"; and for the end and beginning conjointly 3b 7 37T 
This laft difference comes neareft to that mentioned in the Milan 
Ephemeris for the year 1789, which is 36' 41". The obfer- 
vation made at Bologna affigns 45'' 28 7/ E. for the difference of 
the meridians. But the duration of the eclipfe was not pro- 
perly obferved. However, not with ft.an.ding this imperfection. 
It may happen that the refult determined is exaCt. 
The two obfervations of France, viz . that of Viviers, and 
that of Rouen, give almoft the fame difference which I find in 
the Requifite Tables;, that of Rouen differing only i /X , and 
that of Viviers 2 ;/ . As the difference of the meridians between 
Paris anct-Rouen is known with the greateft precifion to be 
4 / 57 " to the W. of Paris ; if to this difference are added 
4' 22 // ,3, which is the difference I found between Rouen and 
Greenwich, there will refult, for the difference of the meri- 
dians between the Obfervatory of Greenwich and Paris, 
9' This difference only differs by 0^,7 from that efta- 
blifhed by Dr. Bradley, which is p' 20", as adopted by 
;yourfelfj and lately confirmed by Major-general Roy. 
