A beautiful reddish or golden glow that appears on high mountain peaks just after sunset or before sunrise, caused by sunlight reflecting through the atmosphere.
From German 'Alpenglühen' (Alpen + Glühen, meaning 'Alps' + 'glow'). Combined from 'Alpen' (the Alps) and 'Glühen' (to glow or shine), the term was adopted into English by mountaineers and naturalists in the 19th century.
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