About the Green Flash

Green flashes are real (not illusory) phenomena seen at sunrise and sunset, when some part of the Sun suddenly changes color (at sunset, from red or orange to green or blue). The word ``flash'' refers to the sudden appearance and brief duration of this green color, which usually lasts only a second or two at moderate latitudes. As the area that turns green is ordinarily near the limit of the eye's resolution, these are sometimes called ``green dot'' displays. There are several quite different phenomena commonly lumped together under the name of ``the green flash'', and this intermingling of disparate phenomena has fostered confusion. So I prefer to say ``green flashes'' and avoid the definite article. For more information on the green flash and many more pictures go to: the green flash page