Two On A Big Ocean The Story of the First Circumnavigation
of the Pacific Basin
in a Small Sailing Ship


      

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Re: Advancing a position circle?

From: Peter Fogg (no email)
Date: Sat Jun 17 2006 - 04:05:00 EDT

  • Next message: Bill: "Re: Set and Drift"

    > Alexandre says:
    > Sure. If you travel 60 miles, the new position line will differ
    > from a circle by a few miles.

    I can understand a slight distortion of the circle moved closer to the poles
    due to the globe not being a perfect sphere. This discussion seems to have
    focused on the agreed fact that a circle moved across the globe is
    distorted; with much fascinating detail, such as a J curve surrounding a
    pole (reminds me of the J curve in economics) but so far seems frustratingly
    vague about just HOW this happens. Why is it most marked at, for example,
    135 degrees?

    Presumably there is more to it than the flattish-poles, if:
    > > discrepancy from a circle is not by an infinitesimal amount, either.
    > > but by something over 14 miles, after a shift of only 60 miles.
    ?


  • Next message: Bill: "Re: Set and Drift"



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