Mr. Ivory on the astronomical refractions , 
491 
TABLE I. 
Mean Refractions for the Temperature of 50° of Fahrenheit, 
and the Barometric Pressure 30 inches. 
Distance 
from 
Zenith. 
* 0 
Log. ^ 0 
Difference. 
Distance 
from 
Zenith. 
n 
Log. 0 0 
Difference. 
0 
0 
1 
2 
3 
4 
5 
/ // 
0 0 
1.02 
2.04 
2.06 
4.08 
S-II 
0.0085 
0.3097 
0.4860 
O.61 12 
O.7086 
3OI2 
1763 
1252 
974 
796 
675 
587 
5 i 9 
466 
424 
388 
359 
334 
3 i 3 
294 
278 
265 
252 
241 
230 
222 
215 
207 
201 
195 
189 
185 
181 
1 77 
0 
3 ° 
31 
32 
33 
34 
35 
u 
33-72 
35- 09 
36- 49 
37 - 93 
39-39 
40.89 
1.5279 
I.5452 
1.5622 
I.5790 
1-5954 
1.61 16 
173 
170 
168 
164 
162 
160 
159 
156 
1 55 
155 
154 
152 
151 
152 
151 
1512 
1514 
1518 
1523 
1530 
1539 
1 55 1 
1565 
1 577 
1596 
1617 
1638 
1 664 
1691 
1722 
6 
7 
8 
9 
10 
6.14 
7.17 
8.21 
9.25 
10.30 
O.7882 
O.8557 
O.9I44 
O.9663 
I. OI 29 
36 
37 
38 
39 
40 
42.42 
44.00 
45.61 
47.27 
48.99 
1.6276 
I -6435 
1.6591 
1.6746 
1.6901 
1 1 
12 
13 
*4 
IS 
"•35 
12.42 
13-49 
14.56 
15.66 
I -°553 
I.O94I 
1,1300 
I.1634 
I-I 947 
4 1 
42 
43 
44 
45 
5°-75 
52.57 
54-43 
56.35 
58.36 
1.7055 
1.7207 
I- 735 8 
1 - 75*0 
1.7661 1 
16 
17 
18 
19 
29 
16.75 
17.86 
18.98 
20.1 1 
21.26 
1. 224I 
I.25I9 
I.2784 
I.3036 
I -3277 
46 
47 
48 
49 
5 ° 
1 0.43 
2.57 
4.80 
7. 1 1 
9.52 
1.78123 
1.79637 
1.81155 
1.82678 
1.84208 
21 
22 
23 
24 
25 
22.42 
23.60 
24.80 
26.01 
27.24 
I * 35°7 
1.3729 
1-3944 
1 - 4 I 5 1 
I- 435 2 
5 1 
52 
53 
54 
55 
12.02 
14.64 
17-38 
20.24 
23.25 
I .85747 
1.87298 
1.88863 
1.90440 
1.92036 
26 
27 
28 
29 
3 ° 
28.49 
29.76 
3 1- °5 
32- 38 
33 - 72 
1-4547 
14736 
1.4921 
1.5 102 
1.5279 
56 
57 
58 
60 
26 41 
29 73 
33 23 
36.93 
40.85 
1.93653 
1.95291 
1.96955 
1.98646 
2.00368 
