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Formeln

Äquatorialen Koordinaten

R = tan(π/2 - δ/2)

θ = α

X = R cos(θ)

Y = R sin(θ)

where (α, δ) = (Rektaszension, Deklination)

Horizontale Koordinate

R = tan(π/2 - alt/2)

θ = az

X = R cos(θ)

Y = R sin(θ)

where (az, alt) = (Azimut, Höhe)

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