2\theta_m

\vec H

\nu_e

\nu_x

\vec H_v

\vec H_m

2\theta_v

2\theta_m

\vec H

\nu_e

\nu_x

\vec H_v

\vec H_m

2\theta_v

\nu(t=0)

\nu(t)

\nu(t)

\nu(t=0)

(a)

(b)

A = Point(zAxis)
B = (2.36242042151925, -2.0412620227246916)
C = (2.279784046395508, 5.633591316892831)
u = Vector(B, C)
D = Point(u)
E = (5.23403445706928, 5.189420800602719)
a = Segment(D, E)
F = Point(a)
G = Point(u)
v = Vector(F, G)
H = (0.5225973068991547, 4.3636488771621496)
w = Vector(F, H)
I = (5.771170895373602, 3.1131818756187055)
J = Point(v)
K = Point(a)
N = (4.462390160925035, 4.705893833067236)
Q = Point(v)
T = Point(v)
B_1 = (-4.178236709755429, -2.0388992938352444)
C_1 = (-4.2608730848791705, 5.635954045782279)
u_1 = Vector(B_1, C_1)
D_1 = Point(u_1)
E_1 = (-1.306622674205399, 5.191783529492167)
a_1 = Segment(D_1, E_1)
F_1 = Point(a_1)
G_1 = Point(u_1)
v_1 = Vector(F_1, G_1)
H_1 = (-0.39762254784423856, 2.4751126972991555)
w_1 = Vector(F_1, H_1)
I_1 = (-0.769486235901077, 3.1155446045081545)
c_1 = Ellipse(G_1, H_1, I_1)
J_1 = Point(v_1)
K_1 = Point(a_1)
L_1 = Point(a_1)
b_1 = Vector(F_1, L_1)
M_1 = Point(b_1)
N_1 = (-3.4576284030773334, 2.8651781439636386)
e_1 = Vector(M_1, N_1)
O_1 = Point(u_1)
f_1 = Vector(M_1, O_1)
P_1 = Point(b_1)
Q_1 = Point(v_1)
g_1 = CircleArc(M_1, P_1, Q_1)
R_1 = Point(f_1)
S_1 = Point(e_1)
T_1 = Point(v_1)
d_1 = CircleArc(R_1, S_1, T_1)
L = Point(w)
M = (3.003974800075018, 2.7561215498176073)
b = Vector(L, M)
O = Point(u)
d = Vector(L, O)
P = Point(d)
R = (2.999283019367315, -0.9143366945539739)
e = Vector(P, R)
S = Point(v)
U = Point(w)
V = Point(w)
W = Point(e)
Z = Point(e)
A_1 = Point(v)
f = CircleArc(W, Z, A_1)
U_1 = Point(b)
V_1 = Point(v)
g = CircleArc(W, U_1, V_1)
W_1 = Point(e)
A_2 = Point(f_1)
B_2 = Point(c_1)
i = Vector(A_2, B_2)
Z_1 = Point(e)
C_2 = (1.2199165851668878, 5.7582874336976175)
c = Segment(Z_1, C_2)
D_2 = Point(i)
E_2 = (-1.5212695431959251, 4.904672455128495)
h = Segment(D_2, E_2)
F_2 = (0.6187792763153938, 4.387694369516209)
G_2 = (2.1817362793292783, 4.916695201305525)
H_2 = (1.905213117257591, 4.411739861870269)
k = Ellipse(F_2, G_2, H_2)
I_2 = Point(c)
J_2 = Point(k)
j = Vector(I_2, J_2)