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    Re: Celestial up in the air
    From: Ken Gebhart
    Date: 2008 Jul 14, 20:53 -0500

    Your article on air navigation was excellent.  I hope people like you and Greg R keep up the good work to remind others that celestial is not forgotten.  I do have a couple of comments about air navigation and your article though.

    Your admonishment to plot quickly due to high speed travel, may imply a misconception among navigators in general.  Navigation is not about knowing where you are, it is about knowing where you WERE, and where you are going to be.  Because it is between the fixes that one solves for the wind acting on his airplane, it is important that the fixes be a few hundred miles apart.  If taken too frequently, the errors in the fixes themselves can yield false wind values which when compared to weather prognosis charts, can give an erroneous analysis of the weather system affecting him.  This, in turn, causes a wrong estimate of when and where he will show up on air traffic control radar at the end of the trip.

    Ken Gebhart

    On Jul 12, 2008, at 2:32 AM, Andres Ruiz wrote:

    Dear Gary,
    your article on Ocean Navigator is very interesting for me, I practice astronavigation at sea and at shore, but never on an aircraft. Your description of the process with the bubble sextant and the HO249 is illustrative.
    Gary LaPook "Celestial up in the air":
    Thnaks to Richard for the link.
    Andrés Ruiz

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