Re: Dipleidoscope

From: Bjorn Gimle (
Date: Fri Jan 17 2003 - 10:16:35 EST

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    The instrument as such is not so crude, but there is not much point in
    trying to measure period from a certain azimuth. While the satellite moves
    in its orbit, the Earth spins below, so BEFORE knowing the orbit (not only
    period) you can't know if you are looking at the same point along the orbit.
    Furthermore most orbits rotate by several degrees/day in its plane, and the
    plane itself by a few degrees/day.
    There are few of us who know that much of celestial mechanics, even less use
    it. We use programs that the few who do know have written, to analyze
    observations (in RA/Dec) posted by ourselves and others.
    Start looking at
    > I agree with you that the dipleidoscope is  "crude" but is simple and
    > effective.
    > On the other side it's a bit discouraging to get book of general
    > celestial mechanics and find my road there, I'd need probably years ...
    > I'd like to read something  intended to taught people in that specifical
    > task, probably.
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