Fig. 2
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Graphical representation of the position of the satellite and definitions of the Sun incidence angle θ0 (in orange), the observer angle θ1 (in dark blue), the Sun phase angle Φ (in green), and the solar elongation angle γ (in brown). Notice that θ0, θ1 and Φ are not contained in the same plane but form a triangular pyramid. The distance is not to scale.
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