SURVEY OF THE EAST OF FRANCE. 
21 
To complete the above, we have to calculate the azimuth of the sun at the time of 
each observation, which gives us the south point for the several stations. These south 
points together with the observed angles will then at once furnish the Declinations. 
Table XVI. 
Station. 
Azimuth of Sun. 
West Declination. 
Rheims 
O 
58 
21 
30-0 
16 
37 
4-0 
Metz 
66 
3 
34-1 
15 
52 
15*1 
Strasburg 
61 
54 
43-3 
15 
28 
23-7 
Issenheim 
52 
25 
20-6 
15 
41 
11*3 
Dole 
48 
24 
26-8 
15 
58 
33*8 
Dijon 
46 
52 
35-0 
16 
30 
10-0 
Avignon 
66 
21 
15*2 
15 
56 
7-2 
Marseilles 
2 
1 
58-8 
15 
34 
45-3 
Monaco 
56 
29 
55-8 
14 
24 
38-8 
Montpellier 
65 
28 
20-7 
16 
25 
56*7 
Grenoble 
40 
18 
20-5 
15 
41 
40-5 
N. D. de Myans 
39 
56 
14-4 
1 5 
3 
45-6 
Mongre 
60 
49 
3-4 
16 
49 
34-4 
St. Etienne 
52 
16 
26-4 
14 
47 
33-4 
Clermont ............... 
57 
42 
27-4 
16 
20 
29-9 
Moulins 
59 
55 
50*5 
16 
22 
4-5 
Paris 
50 
43 
42-6 
17 
8 
23-6 
Douay... 
3 
9 
41-9 
17 
52 
13*1 
Boulogne 
64 
48 
22-8 
18 
6 
16*8 
This Table supplies the data from which the three following equations are deduced : — 
37-551 = 18D — 2253^+2728?/, 
-3727-065= -2253 D + 385109 ?r-404742 y, 
4120-753= 2728 D-404742 tr + 851962 y, 
whose solution gives D=3-4493, a, -=0-0079430, y— —0-0024348. 
Therefore the declination at the central station is 17°-4493, the distance between the 
isogonics of places whose declinations differ by 30' is 60-2 miles, and the angle formed 
by the isogonics with the geographic meridian 17° 2' 30"-5 to the N.E. 
The Table of errors will show the weight to be given to the various observations. 
