| ian i | 
Ay, 7AM RM PANT AWD, Ys LOE Ly, AT; 
7 7 EE Sail 5 al eee EEn | : i A 
| 1891.75 | —0.0028+12.3 | +0.0005 0.00 | +0.0010—0.97 | +0.0036—0.26 | 
EO NE EEEN AS 941.12 — 105— .77|— 614 .24 | 
1902.62 |+ 50—1.0|— 19— .03|— 36— .63|— 19— 64 
1903.72 |— 51—16,1 + 23— .30 | +  ‘204-2:59 | — +34 .90 
1904.89 |+ 22123 | + 4— 789 |--|- 863-4. sijl 42682 
| | 
1907.183 |+ 408H17.4 | — 14141.35|— 42-5.32/— 61— .92 
1908.235.| + 193-15.2|— 412441/57)— 141.20 |— MH .92| 
1909.265 | + 113—6.0|/-+ 574+ .99 | — 5+ .65|—  174— .32 | 
These residuals, or rather the values Av; and Ay; from which 
they were derived, might now be used as the basis of a discussion 
similar to the one carried out by me in Cape X1/, 3 and 5, for 
the derivation of new corrections to the inclinations and nodes. The 
case of satellite I is worthy of notice. Each of the series 1891— 
1904 and 1907—1909 considered separately seems to point to a 
negative correction to the adopted motion of the own node 1. The 
two series taken together, however, confirm the theoretical value. 
For a thorough discussion of all the orbital planes, however, the 
difference of epoch between the observations of Berlin and the Cape 
is still too short. We shall have to wait till about 1920.1) This 
discussion must necessarily be supplemented by a new investigation 
of the inequalities in the longitudes for the determination of the 
masses. The observations which are now being made at the Cape 
and at Johannesburg will furnish a valuable material for such an 
investigation. 
1) See Cape XII, 3 p. 121 and “Elements and masses” p. 720. [Proceedings 
Amsterdam, March 1908, Vol X]. A summary of the present state of the theory 
and of the investigations which are still desirable, is given in History and Descrip- 
tion of the Cape Observatory, pages xcvii to ci. 
