Sunset Colors on Four Different Evenings December 16, 2014 Photographer: Mary Brown Summary Authors: Mary Brown; Jim Foster These images taken during this past summer on four different evenings show the wonderful variety of colors displayed at sunset. Each evenings color is different. For the sequence at top I used an intervalometer to take pictures at consistent intervals over a period of time. Then, I combined the pictures to display each evenings sunset in one image -- approximately 250 pictures for a single sunset. This approach is similar to taking images for a time-lapse. But instead of making a time-lapse video, I used a program called StarStax to combine the pictures into one image. The bottom sequence features just a single picture from each of the series of shots used for the intervalomter/StarStax images. At sunrise and sunset, the increasing path length of sunlight acts to redden the colors we see. However, memorable sunsets usually require an abundance of aerosols (fine dust and ash particles, for instance) and or clouds positioned in such a way to take advantage of the lingering sunlight. Shorter wavelengths of sunlight (greens, blues, and violets) are more readily scattered from our view by minute particles in the atmosphere than are the longer wavelengths (reds, oranges and yellows). Moreover, ozone and water vapor absorb certain green and blue wavelengths, which can further redden the sky. It does no harm to the romance of the sunset to know a little bit about it. -- Carl Sagan Bark Lake, Ontario Coordinates: 45.45, -77.833333 Related Links September Sunset on Bark Lake Rayleigh Scattering Student Links Why is the sky blue and sunsets red? Why is the sky blue, why are sunsets orange, and what color is the Sun? Earth Observatory Sunset Seen from the International Space Station
Posted on: Tue, 16 Dec 2014 13:02:45 +0000
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