From: pmorini@libero.it
Date: Tue Jan 14 2003 - 10:18:41 EST

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      Hi All,
    reading the pages of the book "The Amateur Scientist", printed in New 
    York in 1960 or so, I got the drawing of a simple instrument called 
    "dipleidoscope" consisting in 2 mirrors forming an angle of more than 90 
    deg, say 140 deg, covered by a thin glass window.
    The instrument should show a double image of the passing (bright) 
    satellite moving one against the other.
    When the images melt in one point, this is the time of transit (I 
    learned something similar was used to find the local noon in the XIX 
    Leaving the setup fixed in the backyard one could make measures in a 
    number of nights and then measure the drag effect of the orbiting period 
    - this only for educational purpose and not for exact scientific 
    measurement, of course.
    Someone has experiences about, I'll have a good tima with dipleidoscope 
    or I'll waste my (little) spare time ?
    Other simpler of more effective ways to measure orbital period ? (I am 
    studying the book "Satellite Tracking" by Stanley Macko, printed around 
    1962-63, it deals the problem of tracking and timne measuremente but 
    referring to the use of a kinetheodolite, that's too much for me :-( )
       Paolo Morini - Italy
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