228 8 “Ellipsoid-of-revolution to tangential plane”
A 1
P
∗
A 1
A 2
Φ
∗
P
O
√
X 2 + Y 2
A 1
Fig. 8.2. Circle reduced latitude:
√
X 2 + Y 2 = A 1 cos Φ
∗ .
A 2
P
∗
A 2
Φ
∗
P
O
A 1
Z Z
Fig. 8.3. Circle reduced latitude: Z = A 2 sin Φ
∗ .