1.2 Astro blog
Sept. 6 2014
The Name of this picture is Moonbow beach. It shows
a moonbow shining across the western horizon of a deserted beach scene in
Molokai Island in Hawaii. The strange thing about this picture is there is no
moon. A rainbow is produced by sunlight internally reflected in raindrops from
the direction opposite of the sun back toward the observer. As the light passes from air to water
and back to air again, longer wavelengths are refracted (bent) less than
shorter ones resulting in the separation of colors. The Moonbow is produced as
raindrops reflect moonlight from the direction opposite the Moon. That
puts the Moon directly behind the photographer, still low and rising over the
eastern horizon. This picture is truly breathtaking. I hope one day I will
see a moonbow!
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