Pôle nord

Pôle sud

Greenwich

90° Est

90° Ouest

équateur

Méridien de Greenwich

parallèle

méridien

N: (0, 0, 1)
S: (0, 0, -1)
O: (0, 0, 0)
G: (cos((51.476852 * π / 180)), 0, sin((51.476852 * π / 180)))
E: (0, 1, 0)
W: (0, -1, 0)
Terre = Sphere(O, 1)
c = Circle(zAxis, E)
d = CircumcircleSector(N, G, S)
M = PointIn(Terre)
e = Circle(zAxis, M)
f = CircumcircleArc(N, M, S)
g = CircleArc(O, G, M)
A = Intersect(f, c, 1)
B = Intersect(d, c, 1)
α = Angle(A, O, M)
β = Angle(A, O, B)
h = CircleSector(O, A, M)
k = CircleSector(O, A, B)
lon: "" + (If[y(M) > 0, "E", ""] + (If[y(M) < 0, "W", ""])) + ""
lat: "" + (If[z(M) > 0, "N", ""] + (If[z(M) < 0, "S", ""])) + ""
texte1: "M(latitude : " + (LaTeX[α]) + "" + (LaTeX[lat]) + " ; longitude " + (LaTeX[β]) + "" + (LaTeX[lon]) + ")"