67 
to Avwers's tables occurring in A.N. 3844, with the exception of 
the A.R. Leiden, for which the magnitude equation lately deduced 
by Dr. E. F. v. p. S. B. was adopted; *) 
2. the reduction of Kii to the Fundamental system of Avwnrs, 
only needed for the Decl. and applied according to the table in the 
introduction to Kiistner’s Catalogue, p. 35 ; 
3. the variation during the difference of epoch of the reductions 
Aa, and Ad, of Auwers’ old Fund. Cat. to the new Cat. of the 
Berliner Jahrbuch (A.N. 3927) ; 
4. the variation during the difference of epoch of the corresponding 
reductions Aa; and Ads. 
Reductions | and 2 were introduced everywhere completely, 3 
was not immediately applied to the results of the comparison, while 
of 4 only parts were added to the coordinate-differences found. Besides 
1 and 2 the following corrections were applied on account of 4+: 
a. to the differences Kii— A.G. in R.A.: 
Be A + 0020 instead of + 080205 
Be B 40012" ,; » + 0.0128 
Lei I + 0.018 „ » + 0.0185 
Leiden COO) ae » + 0.0202 
5. to the differences Kii—A.G. in Decl, 
Be A — ("25 instead of — 0"25 
Be B —014 „ » — 0.11 
Lei I OO 55 — 0.22 
Leiden OOO re » — 0:21 
The remaining parts of 4 were brought into account after the 
solution of the equations. For Be A use is also made of the “Reduction 
der aus den Zonenbeobachtungen abgeleiteten Deklinationen auf 
A. G. C.” occurring on p. 131 of the Introduction to this Catalogue. 
The corrections 3 are solved separately. 
From the differences in @ and d thus corrected various means were 
formed. In order to be able to test the influence of the magnitude 
of the stars used — either on account of remaining magnitude-errors 
or of cosmic influences — upon the constants derived from them, 
groups according to magnitude were formed, and that for each hour 
of the right ascension separately. In this it proved preferable, on 
account of the limited number of stars, to confine ourselves to two 
groups according to magnitude. The division was made according 
to the magnitudes given by Kii; the magnitude 8.50 was taken as 
the limit. Thus 
1) Annalen der Sternwarte in Leiden, 9, 386. 
