From: ernesto.alto@libero.it   
      
   "Cray74@gmail.com"  wrote:   
      
   >rnesto wrote:   
   >> But how Huyghens could take landscape pictures?   
   >   
   >You said that Saturn has 1/100th the sunlight that Earth does, which is   
   >correct. However, let me say that another way:   
   >   
   >"At Saturn's orbit, there is about 14 watts per square meter."   
   >   
   >Some comparisons:   
   >   
   >If you put a single 100-watt lightbulb in a 3m x 3m room (a bedroom),   
   >you would have 11.1 watts per square meter. At night, you would   
   >probably think that the bedroom was brightly lit.   
   >   
   >The light of a full moon on Earth is enough for careful landscape   
   >photography. When your eyes adapt to full moonlight, it can even seem   
   >bright. But it is only .001 watts per square meter.   
   >   
   >Titan starts off with dim sunlight (14W/m^2), and then adds thick haze.   
   >However, it is probably better lit than Earth under a full moon, so   
   >there was enough light for landscape photos.   
   >   
   >Huygens used lamps on the ground because it provided light of known   
   >power and color, which was useful for certain scientific measurements.   
   >   
   >Mike Miller   
      
   Thank you very much!   
      
   other questions:   
      
   with 14W/m^2 and a thick atmosphere don't you think the temperature on   
   Titan has to be a little more higher that -180 degrees?   
      
   Do you know if Saturn were in the Titan sky during the Huygens   
   landing? And if yes, how much light it added to which of the Sun?   
   And the night on Titan with Saturn in the Sky, how many watts arrive   
   on the Titan surface?   
      
   Thank you for your attention. Ciao   
   Ernesto   
      
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