Fig. 2.
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Schematic illustration of an eclipse event as seen on the sky plane from the observer line of sight (z-direction, normal to the page). The distance, HCX ≡ d, between the source centre, CX, and the straight line trajectory of the absorber projection centre, C0, during the eclipse, represents a sort of ‘impact parameter’, d, for the occultation and is depicted in red.
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