Table 4: variation rate for in different directions.

Direction (°)δ (%)

014.80
1514.11
3011.38
4510.94
6011.28
7512.44
9012.74
10513.58
12015.76
13517.38
15019.24
16522.28
18017.17
19517.68
21020.21
22519.76
24018.08
25515.25
27015.11
28514.87
30012.81
31512.86
33012.38
34512.39