64 



Ellipsoidal Configurations of Equilibrium [OH. in 



it is approximately true that a satellite cannot rotate with partial secular 

 stability round a planet when within a distance less than about 2J radii of 

 the combined mass, the densities being the same. 



The critical figures for ^> = 0'4, 0*7 and 1*0 are shewn in figures 11, 12, 13 

 which are taken, by permission of the Syndics of the Press, from Sir G. Darwin's 

 Collected Works*. 



=762 



2485 



Fig. 11 (p = 0-4). 



fi=815 



< 0=815 



Fig. 12 (p = 



x=762 



Fig. 13 (p=l-Q). 

 Vol. in. pp. 508, 509. 



