T = t + i c·τ X = x + i k·ξ(τ) Y = y + i k·η(τ) Z = z + i k·ζ(τ)
(T, X, Y, Z) ≈ (ic·τ, x, y, z)
(T, X, Y, Z) ≈ (t, i k·ξ(τ), i k·η(τ), i k·ζ(τ))
ξλ(τ) = ρλ cos(ωλτ + φλ) ηλ(τ) = ρλ sin(ωλτ + φλ) ζλ(τ) = vλ·τ