Fig. 2.
Geometry of the star and planet at a phase where 1 − p < z < 1 + p. The chord DD′ is defined by the intersections between the limb of the star and the limb of the planet. Crosses mark the mid-points of the perpendicular bisector of DD′ between DD′ and the two limbs. These points are at distances ra and rb from the origin, respectively.
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