lichtduisternis

Lichtduisternis, also known as "light darkness," is a phenomenon observed in the night sky where a dark patch appears in the sky, often accompanied by a bright light. This optical illusion is typically seen in the lower part of the sky, near the horizon, and is often mistaken for a UFO or other mysterious object. The term "lichtduisternis" is derived from the Dutch words "licht" meaning light, and "duisternis" meaning darkness.

The phenomenon is caused by the scattering of light in the Earth's atmosphere. When the sun is below the horizon, its light is scattered by the atmosphere, creating a bright band of light known as the anti-twilight arch. This arch can sometimes appear as a bright light in the sky, while a dark patch appears below it, creating the illusion of a dark patch in the sky.

Lichtduisternis is a well-documented optical illusion, and its occurrence can be predicted based on the position of the sun and the observer's location. It is most commonly observed in the tropics and subtropics, where the sun's angle is low and the atmosphere is more likely to scatter light in a way that creates the illusion.

The phenomenon has been the subject of much speculation and folklore, with some people believing it to be a sign of impending doom or a portal to another dimension. However, scientific explanations for lichtduisternis are well-established, and it is generally accepted as a natural optical illusion.