From: Jeff@invalid.invalid   
      
   On 16/11/2025 04:22, Don Y wrote:   
   > Particularly, cloud cover.   
   >   
   > How can I quantify the extent and "density" (opacity) of cloud   
   > cover?   
   >   
   > And, to make it even more interesting, doing so AT NIGHT, as well?   
      
   I guess you want it somewhat more detailed than this   
    >https://en.wikipedia.org/wiki/Okta. The section "How observers on the   
   ground try to estimate sky cover by eye" in ref 4 might be of interest.   
      
   --   
   Jeff   
      
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