Table 1
Davidson's Data
Sun's Altitude
Measured Vertical Diameter*
Vertical Compression (arc seconds)
Measured
Theoretical
Difference
5.00
29.50
150.0
52.0
98.0
30.87
67.8
15.8
5.06
28.08
235.2
51.4
183.8
5.18
30.76
74.4
50.2
24.2
5.25
30.53
88.2
49.5
38.7
5.26
29.68
139.2
49.4
89.8
5.39
30.95
63.0
48.1
14.9
5.50
30.84
69.6
47.0
22.6
5.64
30.09
114.6
45.6
69.0
5.70
29.44
153.6
45.0
108.6
5.78
31.04
57.6
44.2
13.4
5.89
31.32
40.8
43.1
-2.3
5.94
28.66
200.4
42.6
157.8
6.00
30.19
42.0
66.6
30.17
109.8
6.28
31.22
46.8
39.2
7.6
18.4
6.35
30.35
99.0
38.5
60.5
6.43
30.78
73.2
37.7
35.5
6.50
31.33
40.2
37.0
3.2
6.52
30.06
116.4
36.8
79.6
6.56
29.71
137.4
36.5
100.9
6.59
30.05
117.0
36.3
80.7
6.60
30.70
78.0
36.2
41.8
6.63
30.64
81.6
36.0
6.65
31.06
56.4
35.8
20.6
6.70
31.42
34.8
35.4
-0.6
6.80
31.58
25.2
34.6
-9.4
6.85
34.2
28.8
6.94
31.26
44.4
33.5
10.9
31.37
37.8
4.3
7.46
31.51
29.4
29.2
0.2
7.75
31.19
48.6
27.8
20.8
7.85
29.27
163.8
27.3
136.6
8.00
31.25
26.5
18.5
8.04
30.47
91.8
26.3
65.5
8.10
28.60
204.0
26.0
178.0
8.21
31.61
23.4
25.5
-2.0
8.23
29.20
168.0
25.4
142.7
8.26
31.30
16.8
8.36
31.10
54.0
24.7
29.3
8.40
31.38
37.2
24.5
12.7
8.45
30.88
67.2
24.3
43.0
8.50
31.23
46.2
24.0
22.2
8.55
23.8
11.0
8.62
30.45
93.0
23.5
69.5
9.00
30.80
72.0
22.0
50.0
9.17
30.62
82.8
21.3
61.5
9.20
31.14
51.6
21.2
30.4
9.26
31.36
38.4
21.0
17.4
9.30
31.66
20.4
-0.4
9.80
31.21
47.4
18.8
28.6
9.89
31.43
10.07
30.90
66.0
17.7
48.3
10.08
30.91
65.4
47.7
10.26
31.68
19.2
17.0
2.2
10.89
14.8
57.2
11.06
30.92
64.8
14.3
50.5
11.19
30.02
118.8
13.9
104.9
11.61
30.75
75.0
12.8
62.2
11.73
31.50
30.0
12.5
17.5
Mean