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    Geogebra?
    From: Tony Oz
    Date: 2018 Dec 21, 10:03 -0800

    Dear Lars, Seasons Greetings!

    May I ask you if you are familiar with the Geogebra tool?

    I am creating explanations and illustrations for Haversine table - I want to include the properly drawn PZX triangle. The PX and PZ sides are easy to draw - they are just ellipses. I'm stuck with the ZX side - have no idea on how to draw a great circle not passing through poles of a sphere...

    Here is where I got so far.

    I want to use the same sketch for all possible (same-name, contrary-name) allocations by moving Z and X around - with minimum editing where absolutely required.

    Could you please give a mathematical advise here?

    Thank you in advance.

    Warm regards,

    Tony 60°N 30°E

    File:
    PZX.zip
       
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