( 329 ) 



N°. 4, (amplitude 0'^-07), has the same argument as N°. 4 for II, 

 but it now shows the perturbation caused by II. 



N". 5, (amplitude 0°-15), is the equation of the centre; argument 

 Win — ^iii- 



N". 6, (amplitude 0''-04), has the argument i^m— ^iv, it thus must 

 account for a perturbation in III depending on the longitude of the 

 perijovium of IV. 



Nos. 7, 8 and 9, with the amplitudes 2°-98, 0"-18 and 0°-03, 

 serve for the latitude. The arguments are respectively um — Jt, um — Am 

 and tiiii — Aiy. 



IV. Seven terms. 



Nos i, 2 and 3 are similar to those of the preceding satellites. 



N" 4, (amplitude 0°"83), is the equation of the centre, argument 



UlY — ^Tiv- 



Nos 5, 6 and 7 serve for the latitude. N" 5, (amplitude 2°-64) 

 depends on the mean anomaly of Jupiter; its argument therefore 

 is Ua — Jr„. 



N" 6, (amplitude 0''-24), depends on the argument of the latitude 

 of the satellite itself; argument miv— ^iv- 



NV 7, (amplitude 0°04), is a minute perturbation, caused by III; 

 its argument is uiy — Am . 



Now in regard to the following table of the computed conjunctions 



The first column contains the ordinal numbers. 



The second shows the epoch of the conjunction, accurate to the 

 nearest minute, expressed in civil time of Paris. This time is reck- 

 oned from midnight and has been used by Damoiseau in his 

 tables ; it thus represents the direct result of our computations. In 

 the cases that the computed time was just a certain number of 

 minutes and a half, the half minute has been set down. By sub- 

 tracting 12" 9"^ or, where necessary, 12" 9"^ 35, the mean time 

 of Greenwich was found, which is contained in the third columm. 



The 4^'^ and the 5^'i columm contain the numbers of the occulted 

 and the occulting satellite. The appended letters ƒ and n show 

 whether the satellite is far or near' (vide supra p. 304). The satellite 

 is far if its amplitude is between 9'^ and 3% near if it is between 

 3^ and 9^ Furthermore ee denotes an eastern elongation, for which 

 the amplitude is about 3^ and iv e a western elongation, for which 

 the amplitude differs little from 9\ 



22 



Proceedings Royal Acad. Amsterdam. Vol. IX. 



