English edit

Etymology edit

Calque of French heure bleue.

 
Blue hour shot of the south west facade of Berliner Philharmonie

Noun edit

blue hour (plural blue hours)

 
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  1. The period of twilight when the Sun is approximately 4-8° below the horizon and the sky is within a range of blue colors.
    Coordinate term: golden hour

Synonyms edit

Translations edit