Afterglow
As sunset is called a reddish tint of the evening sky with sun is low, so during the sunset . This coloration with the least cloudy sky in the west then changes to dusk .
Emergence
The red coloration of the sky is caused , analogous to the appearance of the dawn , in particular through scattering of small particles in the atmosphere. In addition, there is the effect of diffraction of light rays, which is known as astronomical refraction . A dusty atmosphere is therefore beneficial. The counter-twilight is a special form of the reddish colored evening sky, in which the evening red shows itself on the opposite sky segment.
Trivia
According to farmer rules, a red evening sky is a sign of fine weather (red sunset, good weather forecast), while a sailor's rule that says the opposite (red sunset makes sailors dead) does not apply, but instead the saying "red morning brings ship in need" brings sailor's death "or" dawn bad weather threatens ". In Central Europe, the first rule applies very often. This is because in this region the clouds move over the country from the west . The evening sun only makes the air particles appear red if the sunlight is not obstructed by clouds. The probability of a cloudless sky is then very high, at least for the next twelve hours . With an easterly wind, however, the dawn can be used as an indicator for a cloudless sky for the next few hours for a forecast .
Web links
See also
- dusk
- Purple light
- Alpenglow
- Zodiacal light
- Aurora borealis
- Luminous night clouds
- Photometeor
- Electrometeor
- Astronomical Phenomenology
- Atmospheric optics
- Sky observation
Individual evidence
- ↑ Expert: Farmer rules are "junk" , Focus Online