Re: 3 out of 6

Date: Sat Apr 29 2000 - 17:07:27 PDT

  • Next message: "Re: Apollo Flight Plan"

    >I don't think it's the same. Photo receptors in the retina have to be 
    >by a minimum amount of photons per second to yield a perceptible 
    >output to the brain. If you look at a star at the magnitude limit its 
    >will concentrate on one spot of the retina. An equally bright (fast 
    >moving) satellite will not be visible because its light does not 
    >an individual receptor long enough. Of course you might succeed to 
    >exactly follow the satellite with your eyes but I can't imaginge that 
    >this works precisely enough.
    Don't forget about moving, and averted vision.
    1)  It is well known from Earth experience that moving object are more
    easily seen than stationary objects.
    2)  When you are looking at an object from the side, it seems brighter
    (or at least more distinctly), than looking at it right ahead in one
    Jonathan T. Wojack                                           
    Stay up-to-date on all events in space!  
    Visit   Updated at least once per day!
    Juno now offers FREE Internet Access!
    Try it today - there's no risk!  For your FREE software, visit:
    Unsubscribe from SeeSat-L by sending a message with 'unsubscribe'
    in the SUBJECT to

    This archive was generated by hypermail 2b29 : Sat Apr 29 2000 - 15:26:09 PDT