>
>Tim,
>
>To obtain the best results, of course, the laser was pointed perfectly
>veritically

The laser has to be aimed at the imaging target. As a view of the moon
shows on most nights, atmospheric turbulence varies on an arcminute scale.
And the scope is used to collect the returning light of the artificail star
created when the laser reacts with certain atoms in the upper atmosphere.
-John


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