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    Re: Position from altitude and azimuth.
    From: Antoine Couëtte
    Date: 2020 May 12, 19:56 -0700

    Dear Peter and Lars,

    Excellent example from you Peter and excellent explanation from you Lars.

    -If you follow a great circle from one Departure Point (e.g. Санкт-Петербу́рг) at a given Departure Track Heading and over a given Distance you will eventually hit your arrival point, which is unique.

    - But this does not imply the existence of only one such unique/single Departure Point with both same Departure Track Heading and Distance to hit this very same unique arrival point !

    Since we do not have accurate enough azimuth references on board most craft, we are - or maybe better : at least I am - insufficiently familiar with Equal Azimuth Lines.

    Peter, we have here an excellent example of an Equal Azimuth Line (030° towards one unique arrival point) having 2 different intersections with a circle of equal altitudes centered on that same and unique arrival point.

    I really learnt something here.

    Thanks also and again to you Dave for having given us this example to study.

    Best Regards,


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