340 
PRELIMINARY GENERAL CATALOGUE OF STARS FOR 1900 
The clamp was east in 1872, 1875.67 to 1877.0, 1878, 1880 to 1884. 
CORDOBA 75. A8 S , TO REDUCE SEPARATE YEARS TO CATALOGUE-MEAN. 
Year 
8 
72 
73 
74 - 0 
to 
75 - 67 
75-67 
to 
77.0 
77 
78 
79 
80 
8 
0 
ft 
ft 
// 
ft 
ft 
ft 
ft 
ft 
0 
0 
+ .72 
-.09 
— .10 
+ •33 
-.29 
-•54 
-•63 
+ •59 
0 
- 5 
+ .78 
— .10 
-•17 
+ .26 
-•32 
-.38 
— .62 
+ •54 
- 5 
10 
+ •83 
— .11 
— .20 
+ .18 
-•38 
— .22 
-•59 
+ .48 
10 
15 
+ .87 
-.14 
-•13 
+ .10 
-•44 
-•15 
-•53 
+ .42 
15 
20 
+ .89 
-•17 
— .06 
+ .02 
-•49 
— .11 
-•43 
+ •34 
20 
25 
+ .88 
-.19 
.00 
— .02 
-•52 
— .12 
-.28 
.28 
25 
3 ° 
+ .72 
-.19 
+ .01 
+ .06 
-• 5 i 
-.14 
-•25 
+ .26 
3 ° 
35 
+ •54 
-•17 
+ .01 
+ .19 
-.40 
-.18 
-•23 
+ •23 
35 
40 
+ •47 
-•17 
+ .01 
+ .27 
-• 3 ° 
-.24 
— .20 
+ .19 
40 
45 
+ .41 
-.17 
+ .06 
+ .25 
-•25 
-•32 
-•13 
+ •15 
45 
50 
+ •35 
-•15 
+ •13 
+ .22 
-.18 
-.38 
-.04 
+ .12 
5 ° 
55 
+ .28 
-•i 5 
+ .16 
+ .20 
-•13 
-.41 
.00 
+ .07 
55 
60 
+ •23 
-•13 
+ •15 
+ .18 
-.07 
-.41 
.OO 
+ .05 
60 
65 
+ .18 
— .11 
+ .12 
+ .16 
-.04 
-•36 
.00 
+ •03 
65 
70 
+ •13 
-.09 
+ .09 
+ .12 
.OO 
-.29 
.00 
.00 
70 
75 
+ .10 
— .06 
+ .07 
+ .09 
.00 
— .22 
.OO 
.00 
75 
80 
+ .06 
-.04 
+ .04 
+ .06 
.00 
-•is 
.00 
.OO 
80 
85 
+ •03 
— .02 
+ .02 
+ •03 
.00 
-.07 
.00 
.00 
85 
-90 
.00 
.00 
.OO 
.00 
.00 
.00 
.00 
.OO 
-90 
A8 a , TO REDUCE SEPARATE YEARS TO CATALOGUE-MEAN. 
R. A. 
72 
73 
74-0 
to 
75.67 
75-67 
to 
77.0 
77 
78 
79 
80 
R. A. 
h 
ft 
ft 
ft 
ft 
ft 
ft 
ft 
ft 
h 
0 
— .02 
+ .09 
+ .14 
— .16 
— .08 
-.19 
— .01 
+ •37 
12 
1 
+ .01 
+ .05 
+ .20 
— .12 
-.09 
-.24 
— .02 
+ • 3 ° 
13 
2 
+ .04 
+ .01 
+ .24 
— .08 
-.09 
-.28 
— .02 
+ .21 
14 
3 
+ .06 
-•05 
+ .26 
-•03 
— .10 
-• 3 ° 
-•03 
+ .09 
15 
4 
+ .08 
-.09 
+ .27 
+ .02 
-.09 
-• 3 ° 
-.04 
— .02 
l6 
5 
+ .10 
— .12 
+ .26 
+ .08 
— .08 
-.27 
-•03 
-•13 
17 
6 
+ .11 
-•i 5 
+ •23 
+ •13 
— .06 
-•23 
-•°3 
-•23 
18 
7 
+ .11 
-•17 
+ .19 
+ .16 
-.04 
-•17 
-•°3 
-•32 
19 
8 
+ .10 
-.18 
+ .12 
+ .18 
— .02 
— .11 
— .02 
-.40 
20 
9 
+ .09 
-•17 
+ .06 
+ .20 
+ .01 
-•°3 
— .01 
-•43 
21 
10 
+ .07 
— .16 
— .01 
+ .20 
+ .03 
+ .05 
.00 
-•44 
22 
11 
+ .05 
-•13 
— .08 
+ .19 
+ .06 
+ •13 
+ .01 
-.42 
23 
12 
+ .02 
-.09 
-.14 
+ .l6 
+ .08 
+ .19 
+ .01 
-•37 
24 
When the argument for A 5 a is on the right, employ the opposite sign. 
(10) Cape 80. The values of Aa s for Cape 80 recognize the division into zones. The cor¬ 
rections vary abruptly at — 35 0 , —45°, — 55°, —65°, and — 75 0 of declination. For instance, 
from — 30° to — 35 0 the correction is to be interpolated between + ^034 and +^045, while between 
— 35 0 and — 40° the correction is to be interpolated between + ^014 and + *024. Aa a and A 8 S 
are not supposed sensibly to depend upon the division into zones. 
Since the zones were completed one after another, beginning at the South Pole in 1871 and 
ending in 1878, it might be assumed that there would be a material difference in the AS a that should 
apply to the respective zones, due to the differing amounts of variation of latitude in the correspond, 
ing years. Accordingly the values of A8 a under I have been determined as applicable to the ob¬ 
servations from the northernmost to — 25 0 ; II, from — 25 0 to — 35 0 ; III, from — 35 0 to — 45 0 ; 
and IV, from — 45 0 to the South Pole, it having been regarded as impracticable to determine a special 
correction for each zone southward from — 45 °, owing to lack of material. 
(11) Bradley 1755. On account of the abrupt changes in the curve (attributed to error of 
graduation) it becomes necessary to give the correction AS$ for every degree. The authority 
