[Marxism] America No. 1?

Rod Holt rholt at planeteria.net
Sat Mar 5 12:40:20 MST 2005

The major cause of human perception of twinkle is that the image of a 
really, really small light source is focused to such a small spot on the 
retina--just a few rods & cones--that as the eyeball  moves ever so 
little, the rods & cones turn on and off, as they should. If one has bad 
eyes, the focus is poor, and the effect is lost. City lights at a 
distance will also "twinkle" for this reason unless atmoshpheric 
conditions (various disturbances to the index of refraction, etc.) 
prevent sharp focus.

Les Schaffer wrote:

> Joaquín Bustelo wrote:
>> "I like to think of it as an exploration, ya know, ya don't know what ya
>> might find out on an exploration... like, do the stars still twinkle 
>> when
>> you get outside the atmosphere, or if they are just a steady light"
> hmmm, maybe he's been staring at the Hubble photographs for too long. 
> my understanding is that if you focus visual attention on a bright 
> spot, it can appear to move (psycho-kinetic effect or some such).
> there are other varieties of scintillation besides those due to 
> atmospheric turbulence. but they are on quite different time and 
> spatial scales than we are used to here on earth. perhaps this is what 
> he was refering to???????????????????
> for example, interstellar scintillation:
> http://www.jive.nl/science/iss.html
> http://www.atnf.csiro.au/news/newsletter/oct02/page1.html
> les schaffer
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