Elements of Astronomy, 25 



From the. singular analogy, above alluded to, jt follows 

 that (for a great number of years at lease) the first three 

 satellites cannot be eclipsed at the same time: for, m the 

 simultaneous eclipses of the second and third, the first will 

 always be in conjunction with Jupiter; and vice versa. 



Satellites of Saturn. 

 Seven satellites may be seen, by means of the telescope, 

 to revolve about SaUirn; the elements of which are but 

 little known, on account of their great distance. The fol- 

 lowing table will show the duration of their sidereal re- 

 volutions, and their mean distances in semi-diameters of 

 Saturn. 



The orbits of the first six satellites appear to he in the 

 plane of Saturn's ring : whilst the seventh varies from it 

 very sensibly. 



Satellites of Uranns. 

 Six satellites revolve round Uranus: which, together 

 with their primary, can be discovered only by the telescope. 

 The following table will show their sidereal revolutions, 

 and mean disrances in semi-diameters of the primary. 



All these satellites move in a plane which is nearly per- 

 pendicular to the plane of the planet's orbil^ and contrary 

 to the order of the signs ! 



II. Jn 



