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    Re: Cel nav in space
    From: Bill B
    Date: 2005 Jan 4, 19:31 -0500

    > Do you know the story of the manually-oriented rocket burn on the flight of
    > Apollo 13? It was depicted in the movie. That spacecraft had a "sextant" which
    > was intended to be used in emergency circumstances. This sextant was really
    > intended for orienting the spacecraft, not so much for fixing position. In a
    > real emergency, it proved to be useless because the vehicle was surrounded by
    > a field of artificial stars --little bits of debris from the explosion-- which
    > made it impossible to pick out the real stars. Fortunately, in training
    > someone had thought of using the Earth for orientation, so that's what they
    > did.
    I faintly recalled that, but only am aware of the movie version and even
    then memory is foggy.  Do you know/recall what and how the sextant was to be
    used and what positional information could be extracted?

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