ASTRONOMY: C. D. PERRINE 
377 
proper motion, led to the separation of the stars in the classes A, F, G, 
and K according to proper motion in right ascension into four classes — 0 
■ to !0049, f0050 to !0099, and fOlOO and over, designated respectively 
in the table as small, medium, and large, and the stars having ^contrary' 
parallactic signs, i.e., negative signs in the first and fourth quadrants of 
right ascension and positive signs in the second and third quadrants. 
The sky was divided into areas approximately 30° square and the 
mean of the stars in each region treated as one observation. The 
NORTH 
SOUTH 
u. 
SPECTRAL 
TYPE 
A 
D 
Vo 
A 
D 
Vo 
km. 
km. 
A 
242° 
+ 7° 
-14.2 
306° 
+ 14° 
-20.7 
F 
254 
+ 5 
-23.2 
238 
-11 
-13.1 
Large < 
G 
268 
- 4 
-36.4 
287 
- 6 
-13.9 
K 
277 
+18 
-26.3 
298 
+ 19 , 
-30.0 
260 
+ 6 
-25.0 
282 
+ 4 
-19.4 
A 
260 
- 4 
-22.6 
305 
+20 
-14.5 
F 
253 
-17 
-25.5 
307 
+ 19 
-19.9 
Medium < 
G 
272 
+ 7 
-37.6 
246 
- 6 
-44.1 
K 
262 
-34 
-25.2 
232 
+59 
-21.3 
262 
-12 
-27.7 
272 
+23 
-25.0 
A 
260 
+35 
-17.7 
261 
+ 3 
-20.2 
F 
270 
+37 
-15.0 
264 
+32 
-20.7 
SmaU i 
G 
271 
+27 
-14.6 
242 
+28 
-12.4 
K 
265 
+32 
-19.6 
258 
+39 
-22.4 
266 
+33 
-16.7 
256 
+26 
-18.9 
B 
254 
+27 
-17.0 
288 
+31 
-24.8 
A 
209 
+37 
-12.2 
240 
+ 18 
-18.9 
F 
292 
+58 
-13.3 
204 
+32 
- 8.4 
Contrary. . . . ■ 
G 
207 
+80 
-19.0 
147 
+ 1 
- 6.4 
K 
288 
+44 
-14.2 
292 
+60 
-20.3 
249 
+55 
-14.7 
221 
+28 
-13.5 
Omitting G. . . . 
263 
+46 
-13.2 
245 
+37 
-15.9 
results of least-squares solutions are given in the table. A and D are 
the right ascension and decKnation respectively, of the solar apex and 
Vo the velocity of the solar system. As the stars of class B practically 
all fall in the small proper motion division, the results from them are 
included in that division in the table. 
The principal conclusion from this investigation is that the position 
of the solar apex and the solar velocity appear to vary with the proper 
motions of the stars used in the determination, at least for the fainter 
naked-eye stars of the northern sky, the declination approaching the 
