( 320 ) 



The observation of Luthmer in Hannover, of Octob. 30, 1822 is 

 not contained in this table. Its calculation yields the result : 



Difference + ^-81 + 0'-92 



So there is a difference in the amplitudes, of 0'-81, = 081 X 

 18"-37 = 14"-9, in the latitudes, of -92 = 16"-9. Probably the 

 observation has been made with an unsatisfactory instrument, for it 

 is impossible to' suppose an error of this amount in the tables of 

 Damoiseau for 1822. The difference in sign of the latitudes y and y' 

 is explained by the fact that the longitude of the ascending node of 

 the fixed plane was 1044°-37, which is intermediate between the 

 two jovicentric longitudes. 



As the two satellites moved in the same direction, the hourly 

 change '-of distance was small, viz. 0'-280. It would thus require 

 nearly three hours to annul the difference of 0'-81. 



The remaining conjunctions, however, show a satisfactory accuracy 

 and we may thus expect that the table, as given below, will serve 

 its purpose. 



As a second test I have computed, by the aid of the second part 

 of Damoiseau, the two superior conjunctions and the intermediate 

 inferior conjunctions of II, and I have compared these to those given 



