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    Re: Stereographic Projection of the Ecliptic
    From: Wolfgang Hasper
    Date: 2021 Feb 15, 09:30 +0100
    CAD drawing space is limitless :)
    and it is not that hard to use, once you get the hang of it.
    QCad is a simple but handy tool, the free version should suffice for the task at hand.
    It is available for both Linux and Win, not sure about Apple.
    you can print to pdf or export svg verctor graphics for printing or sharing,
    the generic file format is dxf, so fully compatible
    Best regards
    Gesendet: Montag, 15. Februar 2021 um 08:00 Uhr
    Von: "Geoffrey Kolbe" <NoReply_GeoffreyKolbe@fer3.com>
    An: wolfgang.hasper@web.de
    Betreff: [NavList] Re: Stereographic Projection of the Ecliptic


    The best book I found for the theory of astrolabes and how to build them was "Practical Astronomy" by W. Schroeder, published by Werner Laurie in 1956.

    You need to use the largest piece of paper you can find to draw out the projections so you can make an astrolabe of useful size. The astrolabe I made in the photo below is about five inches across and I needed two A3 pieces of paper taped together to make that.


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