^i On the Annual and Secular Changes 



tremes of those deduced from observation, I rest perfectly 

 satisfied. The observations are, 



Fo7- Mei-curi/s Node. 



Mean 31-52 



Lalande thinks 5Q" answers best for the aphelion of Mer- 

 cury ; but that of Venus has hitherto defied all certainty, on 

 account of the little eccentricity of her orbit, the results vary- 

 ing from 2\ minutes to 40". 



For Mars' s Aphelion. 



Cassini 

 Cassini 

 Flamsteed 

 Lalande 



1592 

 1600 

 1696 

 1743 



1748 



Feb. 15, 



28 49 50 

 23 24 24 



31 34 



1 20 39 

 1 26 10 



5-4 

 3 

 2 



4-3 



66-20 

 63-00 

 60-13 

 62-60 



Mean 63-00 



For Mars' s Node. 



l.TychoBrahel595 



2. Flamsteed 1700 



3. Cassini 1700 



4. Cassini 1721 



5. La Caille 1753 



6. Maskelvne 1778 



7. Bugge' 1783 



Oct. 28, 

 May 7, 

 Mav 6, 

 Nov. 13, 

 Nov. 4, 

 April 17, 

 Dec. 7, 



16 24 33 



17 24 13 

 J7 13 43 

 17 29 49 

 17 42 5 

 17 51 40 

 17 54 24 



1 - 7 28-66 



6 30-25 



5 29-44 



4 31-08 



1(3 + 2) 31-24 



Mean 30-134 

 The 



