Rain­bow, moon­bow, or a com­bi­na­tion of both

Science Illustrated - - MEGAPIXEL HEAVENLY PHENOMENON -

Rain­bows are as­so­ci­ated with rainy days, on which the Sun breaks through, but the clas­sic rain­bow also has a noc­tur­nal vari­ant. Known as a lu­nar fog­bow, is pro­duced in the same way as a rain­bow – only with the Moon as the light source in­stead of the Sun. You can ex­pe­ri­ence the phe­nom­e­non if you look at rain or fog with the full moon be­hind you. The wa­ter drops re­fract and re­flect the light. It's a spec­trum, but be­cause hu­man colour per­cep­tion is poorer at night, the bow looks white. This pho­to­graph also in­cludes an aurora (on right).

Photo // Göran Strand

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