From: Gregg Hendry (
Date: Tue May 29 2012 - 20:31:20 UTC

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    An instrument aboard CALIPSO projects a visible green laser near its ground
    track in order to do atmospheric science.  The laser pulses at about 20 Hz
    and under clear, dark skies makes spots on the ground visible to the naked
    eye.  The spots are something like 90 meters in diameter and 370 meters
    For much more information about CALIPSO the following NASA web site is good:
    Also, coordinate predictions of the beam ground path are usually posted at:
    I have personally seen CALIPSO's laser spots moving across the ground,
    Gregg Hendry
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