ASTRONOMY: G. STROM BERG 37 
zero the constants of the solar motion have the values given in table 1. M 
and m are the arithmetical means of the absolute and apparent magnitudes, 
A and D the right ascension and declination of the sun's apex, V 0 the sun's 
velocity in space, and 6 the arithmetical mean of the radial velocities corrected 
for the sun's motion, taken regardless of sign. The results given by the 
groups of faintest magnitude are necessarily uncertain since the stars included 
within them are almost exclusively in the northern hemisphere and the dis- 
tribution is relatively unfavorable. 
TABLE 1 
Constants of Solar Motion (K = 0) 
NO. 
M 
m 
A 
D 
F and G type stars 
km. 
km. 
211 
0.31 
4.68 
251?4 
+22?5 
19.4 
11.3 
177 
1.44 
5.42 
267.5 
+36.3 
16.6 
14.6 
167 
2.76 
5.27 
272.1 
+36.4 
22.8 
16.3 
170 
5.29 
6.41 
(279.6) 
( + 10.9) 
(27.1) 
(23.9) 
725 
2.32 
5.40 
268.3 
+26.1 
20.1 
17.2 
K type stars 
122 
0.54 
4.22 
279?6 
+33?8 
24.0 
13.7 
245 
1.41 
4.86 
268.1 
+37.2 
20.4 
16.6 
99 
2.58 
5.12 
284.5 
+20.1 
26.0 
18.6 
79 
7.07 
7.41 
(289.0) 
(+26.5) 
(22.1) 
(26.2) 
545 
2.25 
5.13 
277.0 
+ 32.5 
22.2 
18.5 
M type giants 
135 
1.5 
4.98 
264?2 
+26?1 
26.8 
16.9 
All stars of late type 
A = 270?9 ± 3?3 D = + 29?2 ± 3?4 V Q = 21.48 ^ 1.02 km 
&= 17.7 km K=+ 0.36 ± 0.60 km 
There appears to be a tendency toward smaller values of the declination 
for the intrinsically faint stars. If real this effect may be explained on the 
assumption of a variation in the proportion of stars belonging to the two star 
drifts. A marked feature of the results is the increase of the average radial 
velocity with decreasing brightness. 
Stream Motion. — For a study of stream motion the stars with measured 
radial velocities have been divided into three groups, as follows, according to 
absolute magnitude: 
