( 309 ) 



For the CVape of Good Hope : 







The circumstances are tlius seen to be considerably more favourable 

 for a southern than for a northern observatory. 



Several of the occultations will not be visible because the common 

 elongation falls short of unity i. e. of the radius of Jupiter. This is 

 the case of Xos. 8, 9, 12, 13, 15, 16, 20, 23, 39 and 64. In the first 

 eight of these cases and in the last one the planet stands between 

 the two satellites. In case Ko. 39 both the satellites I and IV are 

 covered by the planet ^). 



For other conjunctions it may happen that one of the satellites is 

 invisible because of its being in the shadow of the planet. Such cases are : 



If the satellite which at the conjunction is nearest to the Earth 

 is eclipsed by the planet's shadow, it might, as seen from our stand- 

 point, project itself wholly or partially as a black spot on the other 

 satellite. The case however has not presented itself in our computations. 



Possibly the last of the conjunctions just mentioned may really 

 be visible; foi* according to the iV. Almanac, the reappearance of 

 IV from the shadow of the planet takes place at 12'^l"'^h^ M. 

 T, Greenwich and the predicted eclipses of this satellite are occasionally 

 a few minutes in error. A few minutes later, according to the N. 

 Almanac at 12''16™, II enters the disc of Jupiter. 



1) According to the Nautical Almanac we have for this night (M. T. of Greenwich): 



IV. Occultation Disappearance 10^19™, 



I. Occultation Disappearance 11 20, 



I. Eclipse Reappearance 14 26 27^, 



IV. Occultation Reappearance 15 13, 



IV. Eclipse Disappearance 18 5 6 , 



IV. Eclipse Reappearance 22 52 2 . 



