Skip to comments.Astronomy Picture of the Day -- A Circumhorizontal Arc Over Ohio
Posted on 05/23/2014 9:51:32 PM PDT by SunkenCiv
Explanation: Why would clouds appear to be different colors? The reason here is that ice crystals in distant cirrus clouds are acting like little floating prisms. Sometimes known as a fire rainbow for its flame-like appearance, a circumhorizon arc lies parallel to the horizon. For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds are present. Furthermore, the numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a collectively similar manner. Therefore, circumhorizontal arcs are quite unusual to see. This circumhorizon display was photographed through a polarized lens above Dublin, Ohio in 2009.
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[Credit & Copyright: Todd Sladoje]
BTW: I was wondering if there was a pot-o gold at the end of that rainbow? < /humor >
Wow! That’s awesome!
Each one of your photos is better than the APOD photo. Thanks for posting them.
That only happens in Colorado. ;’)
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