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Blue hour at the Old Cathedral of the Holy Name of Jesus, Bragança in Portugal. The blue hour (from French l'heure bleue; [1] [a] pronounced [lœʁ blø]) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon. During this time, the remaining sunlight takes on a ...
The period of time shortly before the magic hour at sunrise, or after it at sunset, is called the "blue hour". This is when the sun is at a significant depth below the horizon, when residual, indirect sunlight takes on a predominantly blue shade, and there are no sharp shadows because the sun either has not risen, or has already set.
Here, the path of sunlight through the atmosphere is elongated such that much of the blue or green light is scattered away from the line of perceivable visible light. This phenomenon leaves the Sun's rays, and the clouds they illuminate, abundantly orange-to-red in colors, which one sees when looking at a sunset or sunrise.
And we see the blue light instead of violet light because our eyes are more sensitive to it and the sun emits more blue than violet energy. We also see the Rayleigh effect at play in: - Sunsets ...
Shade illuminated by entire clear blue sky, midday 10 5: 100 kilolux ... Brightest sunlight Luminance. This section lists examples of luminances, ...
The USA TODAY Network will also be livestreaming the eclipse from multiple locations, including Washington D.C., Texas, Oklahoma, Indiana and New York. Watch it here:
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Sunlight shining through clouds, giving rise to crepuscular rays. The spectrum of surface illumination depends upon solar elevation due to atmospheric effects, with the blue spectral component dominating during twilight before and after sunrise and sunset, respectively, and red dominating during sunrise and sunset.