The twilight period when the sun is about 4°–6° below the horizon and the sky takes on a deep blue color.Put it to useGolden hour vs blue hourGolden hour calculatorGuides that use this termHow to Photograph a SunriseLighthouse PhotographyHow to Photograph SunsetsRAW Processing Workflow for LandscapesStar Tracker Guide for BeginnersRelated termsAuroraAzimuthBacklightBokehBortle scaleBracketing
