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Shadowing geometry. (Left) Schematic. The L1 point and the common Earth–moon barycenter remain in-line as they both orbit the sun with a 1-year period (not to scale). (Right) Time-averaged view from Earth. The Earth wobbles with a 1-month period relative to the penumbral shadows cast from a sunshade at 1.5 and 2.4 Gm (dashed circles).
