MATHEMATIC4L PAPERS, 45 



Saturn, the. moft diftant from the fvm of all the planets in 

 the machine, with his axis perpendicular to the ecliptic, per- 

 forms his annual courfe in 29 years, 167 days, i hour. 



The Satellites of Jupiter and Saturn,- at their diiFerent dif- 

 tances, nearly in true time, revolve round their primaries 5 

 the one moft remote from Jupiter revolves in its inclined or- 



- 



bit; the orbits of the other three are coincident with the 

 plane of the echptic. Saturn's Eve fatellites,* in their revolu- 

 tions, keep in the ; plane of his ring, which forms an angle 

 with the plane of the ecliptic of 3 degrees, and preferves its 



w 



parallehfm round the Sun. , 



There are two dial plates, one Ihewing the common, the 

 other the fidereal time ; alfo fever al other pieces, which may 

 be applied occafionally, viz. a fmall horizon circle, femi- 

 circle, folar ray, &:c. The whole machine is put in motion 

 by the turn of a fingle winch. 



JOSEPH POPE 



]Sfovemher 12, 1794* 



M 



ore Dr. 



HerfcbeVs difcof ery of Uic two additional fatellites of Saturn was 



