Contrails and Aviation-induced Cirrus Clouds
  

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The visibility of contrails and aviation-cirrus is often very different, depending on which part of the sky you look. Opposite the sun they fade into the the general light-blueness of a sky full of (frozen) watervapour.
  
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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.