From: blockedofcourse@foo.invalid   
      
   On 11/24/2025 12:04 AM, Mikko S wrote:   
   > Don Y  writes:   
   >   
   >> On 11/16/2025 11:51 PM, Mikko S wrote:   
   >   
   >>> I've got an open souce Indi-Allsky camera, which counts the number of   
   >>> visible stars. Moon, Sun, automatic exposure and auroras will mess up   
   >>> that number in addition to clouds, though.   
   >>   
   >> Knowing the location of your camera and its orientation (and the date/time),   
   >> you should be able to examine portions of its field to determine *where*   
   >> the cloud cover exists, etc., right?   
   >   
   > Yes, that should work. But just by having constant or controlled   
   > exposure, you can pretty easily determine if there are 'some dots'   
   > visible in a given sky segment. This would get rid of alignment issues   
   > and should give good enough result for most purposes.   
      
   Alignment is important because we want to know how cloud cover will   
   move to give us an idea of "what's coming".  *Watching* it move doesn't   
   tell us if it is moving the way we expect.   
      
   E.g., we were able to anticipate rain the other day because we   
   could see it on the other side of town and knew that storms   
   always move "this way".   
      
   We were heavily overcast the next day yet saw NO rain.  But, could   
   see as the clouds were preparing to move out.  Regardless, we would   
   have known that any PV array output would be greatly reduced WHILE   
   overcast.   
      
   Then, another group coming in with more rain.   
      
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