228 
Gen . Roy’s Account of 
Art. XV. Comparifon of the old longitudes of fame places on the 
Jkirts of the kingdom of France with what they will be when 
computed by the new data. 
If the preceding determinations of the longitudes of the 
feveral Rations between Greenwich and Dunkirk are accurate, 
or nearly fo } as founded immediately on the Bntifh oufeiva* 
tions, and ultimately combined with the refult of the opera- 
tion in. latitude 43 0 32% it follows, that all the longitudes of 
the great map of France, the labour of more than half a 
century, will be confiderably affedted thereby, in proportion 
to the diftances of the places, eaftward or weft ward, fiom the 
meridian of the Royal Obfervatory at Paris refpeclively. 
To fhew the effedf produced by the new data , we. fhall col- 
lect, in the following table, the latitudes and old longitudes of 
a few noted places on the Ikirts of that great kingdom, and 
annex to them the new longitudes refulting from computations 
made with new lengths of degrees of great circles, perpendi- 
cular to the meridian, correfponding to their latitudes reflec- 
tively. It will readily be conceived, that the objedt here in 
view is folely this ; namely,' that aftronomers who live near thofe 
places, and who have their time, that is to lay, the directions 
of their meridians very accurately afcertained, may, by their 
future correfponding obfervations (which fhould only be occul- 
tations of the fixed ftars behind the moon’s dark limb) com- 
pare the old with the new longitude, and thus be enabled to 
fatisfy the curious world, which of the two comes neareft 
to the tfuth. 
Com- 
