268 
PRELIMINARY GENERAL CATALOGUE OF STARS FOR 1900 
If we gather the residuals, C -0 in A a and A 5 for the meridian-observations (extending from 
1757 to 1900) into the revolution included between 1861 and 1901, we have the following repre¬ 
sentation of normal places: 
Meridian Observation C -0 in Aa and As. 
R. 
A. 
Decl. 
Date. 
No. of 
Catal. 
Weight. 
Aa. 
Date. 
No. of 
Catal. 
Weight. 
A8. 
1863.0 
4 
J 5 
n 
-•17 
1863.3 
6 
18 
// 
+ .04 
1865.6 
6 
2 5 
-.07 
1865.2 
3 
14 
+ -I5 
1869.3 
5 
23 
+ .07 
1869.1 
5 
14 
-•05 
1871.9 
5 
11 
+ •15 
1871.9 
4 
7 
— .26 
1875.0 
6 
r 7 
+ .04 
1874.4 
4 
7 
— .21 
1877.9 
5 
20 
+ .08 
1877.2 
7 
17 
— .12 
1881.3 
4 
13 
+ .17 
1882.1 
9 
34 
— .02 
1885.0 
7 
25 
-.09 
1886.3 
3 
13 
+ •13 
1889.5 
9 
34 
—.02 
1889.9 
7 
21 
+ .09 
1895.1 
6 
19 
+ .04 
1894.9 
6 
19 
+ .01 
1899.1 
4 
14 
+ .07 
1898.0 
S 
14 
-•°3 
The probable error of the unit of weight from the above residuals (three unknown quantities) is 
±('29, while the theoretical value is ±"30. The representation seems to be satisfactory. 
The following table gives the quantities which must be added at the respective dates to the 
position of the center of gravity, as printed in this Catalogue, in order to have the position of the 
principal star at that date. By adding or subtracting multiples of 39 years to the arguments of this 
table, the value of Aa and A6, with a slight correction for precession, can be computed for other 
dates. If positions of the fainter star are required, multiply the tabular numbers by —3.05 and 
add to the position of the center of gravity. 
Date. 
Aa. 
AS. 
Date. 
Aa. 
AS. 
Date. 
Aa. 
AS. 
s 
// 
s 
// 
s 
// 
1862 
+.026 
— 
i-i5 
1883 
— .040 
+ 
•45 
1904 
+ .005 
— 
1.26 
1863 
+.019 
— 
1.20 
1884 
— .029 
+ 
•56 
1905 
-.003 
— 
1.26 
1864 
+.012 
— 
1.24 
1885 
— .016 
+ 
•63 
1906 
— .010 
— 
1.25 
1865 
+.005 
— 
1.26 
1886 
— .002 
+ 
•65 
1907 
— .017 
— 
1.22 
1866 
—.002 
— 
1.26 
1887 
+ .012 
+ 
.62 
1908 
— .024 
— 
1.19 
1867 
—.010 
— 
I - 2 S 
1888 
+ .025 
+ 
•54 
1909 
-.031 
— 
1.14 
1868 
—.017 
— 
1.23 
1889 
+ .036 
+ 
.41 
1910 
-•037 
— 
1.08 
1869 
—.024 
— 
1.19 
1890 
+ .O45 
+ 
•25 
1911 
-•043 
— 
1.00 
1870 
-.030 
— 
1.14 
1891 
+ .05I 
+ 
.10 
1912 
— .048 
— 
.91 
1871 
-•037 
— 
1.07 
1892 
+ -°55 
— 
.07 
1913 
-•053 
— 
.81 
1872 
-•043 
— 
.99 
1893 
+ -°57 
— 
.24 
1914 
-.056 
— 
.69 
1873 
—.048 
— 
.91 
1894 
+ •057 
— 
.40 
1915 
— .060 
— 
•57 
1874 
-•053 
— 
.81 
189s 
+ .056 
— 
•55 
1916 
— .061 
— 
•43 
1875 
-•057 
— 
.70 
1896 
+ -°53 
— 
.69 
1917 
— .062 
— 
.29 
1876 
—.060 
— 
•57 
1897 
+ .049 
— 
.81 
1918 
— .061 
— 
•13 
1877 
—.062 
— 
.44 
1898 
+ .044 
— 
.92 
1919 
-•059 
+ 
.02 
1878 
—.062 
— 
.29 
1899 
+ .038 
— 
I.OI 
1920 
-•054 
+ 
•17 
1879 
—.061 
— 
.14 
1900 
-f .032 
— 
1.09 
1921 
— .048 
+ 
•32 
1880 
-•059 
+ 
.01 
1901 
+ .026 
— 
1.16 
1922 
-•039 
+ 
•45 
1881 
-•055 
+ 
•17 
1902 
+ .019 
— 
1.20 
1923 
— .028 
+ 
•5*5 
1882 
—.048 
+ 
•32 
1903 
+ .012 
— 
1.24 
1924 
— .016 
+ 
•63 
1925 
— .002 
+ 
•65 
