100 DR J. HALM ON 
computing the constants of this entirely empirical formula, I found that c had the same 
value for all the three groups, but that a and b showed considerable differences. The 
value of c was found to be 1°01447 if 8 is expressed in degrees, and 2°2784 if 
expressed in units of the sun’s radius. The constants a and b in each of the three 
groups are given in the following table, which also contains the comparison between the 
observed values of v and those computed by means of the preceding formula. 
Tasix ITT. 
GRouP a b 
1887-9 (Dunér) 2°349 0°354 
1901-2 (Halm) 2°292 0:370 
1903 do. 2°066 0°148 
Group 1887-9. 
B v (comp.) v (observed) obs. — comp. 
0-4° 1:99 km. 1:98 km. -—0-01 
15:0 1°85 1°85 0:00 
30°0 1:56 1°58 +0:02 
45:0 119 inte) 0:00 
60°0 0-76 0-74 — 0°02 
74:8 0:34 0°34 0°00 
Group 1901-2. 
B v (comp.) v (observed) obs. — comp, 
16° 1:908 1:908 0-000 
52 1-881 1:894 +0013 
8:3 1°851 1871 +0°020 
12°8 sire 1-802 + 0-005 
18-0 1°720 1-720 0-000 
23:8 EGIL 1:594 — 0:023 
30°6 1-474 1:488 +0014 
38°7 1:281 1:265 — 0:016 
47°3 1:055 1:061 + 0°006 
55'8 0°822 0°840 +0:018 
65-1 0°566 0°560 — 0:006 
75°5 0°299 0:307 + 0:008 
Group 1903. 
B v (comp.) v (observed) obs. — comp, 
37° 1-906 1:898 — 0-008 
sail 1:874 1:883 + 0-009 
155 1:813 1831 +0:018 
ri lel 1-741 1:753 +0012 
27°7 1:633 1:631 — 0:002 
34:0 1513 1512 - 0-001 
40°3 1:374 1:365 — 0:009 
47°1 1:209 1-207 — 0-008 
54-7 1:008 1:014 + 0-006 
62°3 0-792 0797 + 0:005 
69-2 0592 0564 — 0-028 
76:0 0:393 0°408 +0:015 
83:0 0:192 0°187 —0°005 
