JCPL Teens

I am currently reading the book "Code Name Verity" by Elizabeth Wein.  In the book the main characters are flying a plane and observe a green flash.  I had not heard of this so decided to investigate.  Rarely, a green flash may be observed at either sunrise or sunset.  It is an optical illusion where a green ray of light is observed caused by differential refraction of light waves.  Observation is easier over the ocean where the horizon is not obstructed by trees or hills.  It is also usually seen on a still day with clear air. 

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