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A plane lights on monochromatically and immediately after lights off, whilean observer starts moving out from the plane, perpendicularly to it, withconstant proper acceleration. Special relativity predicts that the observerwill see a light circle always in the direction opposite to the plane, withoutDoppler effect, and that the circle will seem to progressively shrink to apoint.    Ebeno eklumi^gas unukolore kaj tuj poste mallumi^gas, dum observantoekmovi^gas orte el ebeno kun konstanta propra akcelo. Special-relativecoanta^udiras, ke observanto vidos luman cirklon ^ciam en direkto mala al laebeno, sen Dopplera efiko, kaj ke tiu cirklo ^sajnos progrese eti^gi ^gispunkto.

Dopplera efiko de luma ebeno vidata per akcelata observanto