[Marxism] America No. 1?
giobon at sbcglobal.net
Sat Mar 5 15:07:58 MST 2005
Thanks, Rod, for this very interesting bit of information.
On 3/5/05 11:40 AM, "Rod Holt" <rholt at planeteria.net> wrote:
> 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
>>> 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:
>> les schaffer
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