Weekly Photo Challenge: Silhouette

Sunset Playtime on Greek Island of Amorgos

As the sun begins to set, light must travel farther through the atmosphere before it gets to us and more of the light is reflected and scattered.  As less reaches us directly, the sun appears less bright and the colour of the sun appears to change, first to orange and then to red and this is because even more of the short wavelength blues and greens are now scattered and only the longer wavelengths are left in the direct beam that we can see.

What makes it even more dramatic is that the sky around the setting sun takes on a lot of different colours and the most spectacular shows occur when the air contains many small particles of dust or water because these particles reflect light in all directions and then as some of the light heads towards us, different amounts of the shorter wavelength colours are scattered out and we get to see the longer wavelengths and the sky appears red, pink or orange.

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