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The Blue Light of Dawn
The blue variations in this image that I shot in the pre-dawn darkness happened because the sun was at a significant depth below the horizon and the residual indirect sunlight took on a predominantly blue shade.
This effect is caused by the relative diffusibility of short blue wavelengths of light versus the longer red wavelengths.
During this period known as the blue hour, (typically a period about 20 minutes in length) red light passes straight into space while blue light is scattered in the atmosphere and therefore reaches the Earth's surface, allowing you to create images like I was able to on this morning.
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