334 
TERRESTRIAL AND SOLAR RELATIONS 
TABLE 76 
Solar Magnetic Ephemeris, Period 26.679 Days, Epoch 
June 13.72, 1887 
1840 
Jan.16.87 
1870 
Jan. 24.05 
1900 
Jan. 5.55 
41 
Jan. 24.38 
71 
Jan. 5.88 
01 
Jan. 14.06 
42 
Jan. 6.21 
72 
Jan. 14.39 
02 
Jan. 22.57 
43 
Jan. 14.72 
73 
Jan. 21.90 
03 
Jan. 4.40 
44 
Jan. 23.23 
74 
Jan. 3.73 
04 
Jan.12.91 
45 
Jan. 4.06 
75 
Jan. 12.24 
05 
Jan. 20.42 
46 
Jan. 12.57 
76 
Jan. 20.75 
06 
Jan. 2.25 
47 
Jan. 21.08 
77 
Jan. 1.59 
07 
Jan. 10.76 
48 
Jan. 2.91 
78 
Jan. 10.09 
08 
Jan. 19.27 
49 
Jan. 10.42 
79. 
Jan. 18.60 
09 
Jan. 26.78 
1850 
Jan.18.93 
1880 
Jan. 27.11 
1910 
Jan. 8.61 
51 
Jan. 27.44 
81 
Jan. 7.94 
11 
Jan. 17.12 
52 
Jan. 9.27 
82 
Jan. 16.45 
12 
Jan. 25.63 
53 
Jan. 16.78 
83 
Jan. 24.96 
13 
Jan. 6.46 
54 
Jan. 25.29 
84 
Jan. 6.79 
14 
Jan. 14.97 
55 
Jan. 7.12 
85 
Jan. 14.30 
15 
Jan. 23.48 
56 
Jan. 15.63 
86 
Jan. 22.81 
16 
Jan. 5.31 
57 
Jan. 23.14 
Epoch 87 
Jan. 4.64 
17 
Jan. 12.82 
58 
Jan. 4.97 
88 
Jan.13.15 
18 
Jan. 21.33 
59 
Jan.13.48 
89 
Jan. 20.66 
19 
Jan. 3.17 
1860 
Jan. 21.99 
1890 
Jan. 2.49 
1920 
Jan. 11.67 
61 
Jan. 2.82 
91 
Jan. 11.00 
21 
Jan. 19.18 
62 
Jan.11.33 
92 
Jan. 19.51 
63 
Jan.19.84 
93 
Jan. 27.02 
64 
Jan. 1.67 
94 
Jan. 8.85 
65 
Jan. 9.18 
95 
Jan. 17.36 
66 
Jan. 17.69 
96 
Jan. 25.87 
67 
Jan. 26.20 
97 
Jan. 6.70 
68 
Jan. 8.03 
98 
Jan. 15.21 
69 
Jan.15.54 
99 
Jan. 23.72 
The Semiannual Reversal of the Direct and Inverse Types 
Period 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
D 
17 
32 
42 
41 
18 
7 
13 
33 
43 
41 
30 
16 
10 
12 
I 
37 
22 
12 
13 
36 
47 
41 
21 
11 
13 
24 
38 
44 
42 
Type 
I 
D 
Dmax 
. D 
I 
Anax 
I 
D D max 
D 
D 
I 
Tmax 
I 
The direct type prevails annually, February 1 to April 20. 
The direct type prevails annually, July 15 to October 15. 
The inverse type prevails annually, April 20 to July 15.