Knowra Blue hour Blue hour Blue hour is the period shortly before sunrise or after sunset when the Sun is below the horizon and indirect light gives the sky a predominantly blue appearance.
Twilight : The interval when sunlight illuminates the atmosphere while the Sun is below the horizon. Blue hour is a phase of twilight, occurring when indirect sunlight dominates the sky.
Blue hour photography : Photography made during blue hour, using its cool ambient light and contrast with artificial illumination. It turns the period’s distinctive color and low light into a deliberate visual style.
Sunrise : The daily event when the Sun’s upper edge first appears above the horizon. The morning blue hour ends as sunrise brings direct sunlight above the horizon.
Urban photography : Photography that depicts cities, their architecture, streets, and public spaces. City lights remain visible against the blue ambient sky during evening blue hour.
Rayleigh scattering : The scattering of light by particles much smaller than its wavelength, with shorter wavelengths scattered more strongly. It helps explain why twilight skies can appear blue after direct sunlight fades.
Long-exposure photography : Photography made with a shutter open long enough to record motion or accumulate light over time. Long exposures can brighten blue-hour scenes and render moving lights as trails.
Sunset : The daily event when the Sun’s upper edge disappears below the horizon. The evening blue hour follows sunset as indirect twilight light remains.
Landscape photography : Photography of natural scenery, including landforms, vegetation, and skies. Blue hour gives landscapes subdued light and strong color contrasts.
Solar depression angle : The angular distance of the Sun below the horizon, measured from the horizon downward. It locates blue hour within twilight, though its precise bounds vary by definition.
White balance : The adjustment of image colors so objects that appear neutral under a light source are rendered neutral. White-balance choices determine how strongly a photograph preserves blue-hour’s cool cast.
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