ASTRONOMY. 177 



The secular variations of the nodes for these three 

 planets, and for Juno, have not yet been determi- 

 ned. 



The Second Table gives the times of the siderial re- 

 volutions in days; the mean distances from the 

 Sun, or the semi-transverse axes of the orbits, on 

 the supposition that the mean distance of the 

 Earth is 1 , also the eccentricity of each orbit, 

 supposing the semi- trans verse of that orbit to 

 bel. 



The Third Table gives the mean longitude of each 

 planet for the 1st of January 1801, to the meri- 

 dian of Greenwich ; also the mean longitude of 

 the perihelion, or lower apsis of the orbit, with the 

 secular variation. See Exposition du Systeme du 

 Monde, 3me ed. BIOT, torn. HI. 29. WOOD- 

 HOUSE, 'Ast. p. 286. 



VOL. IL M notation 



