[HN Gopher] Reconstruction of Lomonosov's Discovery of Venus's A...
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       Reconstruction of Lomonosov's Discovery of Venus's Atmosphere
       (2012) [pdf]
        
       Author : benbreen
       Score  : 41 points
       Date   : 2024-11-09 05:28 UTC (4 days ago)
        
 (HTM) web link (lss.fnal.gov)
 (TXT) w3m dump (lss.fnal.gov)
        
       | 082349872349872 wrote:
       | So one eye-friendly way to observe the sun (at least in summer)
       | is to stand under a deciduous tree canopy and look down: under
       | suitable candidates there will be several foliage-diffracted
       | circles in evidence among the general shadow.
       | 
       | Do these reflect the solar disk, or are they circular due to a
       | different process? If the former, would it be possible (with
       | enough magnification) to get similar images during a Venusian
       | transit?
       | 
       | > " _At the time we were all making astronomical observations at
       | a dollar per figure, I realised that for centuries we had only
       | one model for this scientific discipline..._ " -- not AAJARENyC,
       | "Transit of Venus" (1977)
        
         | photochemsyn wrote:
         | The circles are due to the pinhole camera effect I believe -
         | during a partial eclipse of the sun by the moon the circles
         | will have a disc cut out of them, similar to a hole in a sheet
         | of paper. I've noticed this effect myself during a partial
         | eclipse.
        
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       (page generated 2024-11-13 23:00 UTC)