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Mirage of astronomical objects
A mirage of an astronomical object is a naturally occurring optical phenomenon, in which light rays are bent to produce distorted or multiple images of an astronomical object. The mirages might be observed for such astronomical objects as the Sun, the Moon, the planets, bright stars and very bright comets. The most commonly observed are sunset and sunrise mirages.
==Mirages versus refraction==
Mirages are distinguished from other refraction phenomena. One of the most prominent features of mirages is that a mirage might only produce images vertically, not sideways, while a simple refraction might distort and bend the images in any way. The distortion in both images displayed in this section was caused by refraction, but while the image on the left, which is a mirage, demonstrates only vertical, distortion, the image on the right demonstrates distortion in all the ways possible. It is easier to see the vertical direction of the mirage not even at the mirage of the Sun itself, but rather at the mirage of a sunspot. As a matter of fact it is at least a three-image mirage of a sunspot, and all these images show a clear vertical direction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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