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    Re: DIY planisphere: how to begin with it?
    From: Gary LaPook
    Date: 2016 Oct 19, 00:29 -0700

    See prior posts:

    http://fer3.com/arc/m2.aspx/Modifications-2102D-LaPook-apr-2009-g7982

    http://fer3.com/arc/m2.aspx/Modifications-2102D-LaPook-apr-2009-g7986

    http://fer3.com/arc/m2.aspx/Sun-AltitudeAzimuth-2102D-LaPook-oct-2010-g14113

    http://fer3.com/arc/m2.aspx/Star-finder-2102D-further-modification-LaPook-nov-2010-g14300

    http://fer3.com/arc/m2.aspx/Yet-another-modified-2102D-star-finder-LaPook-jan-2013-g21846

    http://fer3.com/arc/m2.aspx/Star-finder-2102D-further-modification-LaPook-nov-2010-g14311

    http://fer3.com/arc/m2.aspx/Star-finder-2102D-further-modification-LaPook-nov-2010-g14314

    http://www.fer3.com/arc/imgx/IMG_0148.JPG

    http://www.fer3.com/arc/imgx/IMG_0151.JPG

    http://www.fer3.com/arc/imgx/IMG_0153.JPG

    gl

    --------------------------------------------------------------------------------------

    From: Frank Reed
    Date: 2016 Oct 18, 13:48 -0700

    Brad Morris, you wrote:
    "There are many other things you can play with, like adding altitude lines for astronomical, nautical and civil twilight.  So you turn it into a sunrise/sunset calculator.  Of course, you have to be able to plot the sun to do that.  Some versions I posted have that facility."

    Yes, this is a great addition, and it's something that Gary LaPook and various others (me included) have suggested, too. Point being that there's lots of agreement that this is a good idea, worth the effort.

    You do this by adding simple altitude "arcs" for -6°, -12°, -18° for civil, nautical, and astronomical twilight respectively, or just one or two of these depending on your interests.

       
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