Contrails and Aviation-induced Cirrus Clouds
  
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When you look into the direction of the sun, contrails show more contrast against the blue-ish background of the sby.

  
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The filenames of the pictures contain the dates and times on which they were taken,
in the format cc-yyyymmdd-hhmmss

Contrails lead to aviation-induced cirrus
and thus influence weather, climate and sunlight.