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Re: DIY planisphere: how to begin with it?
From: Andrew Nikitin
Date: 2016 Oct 17, 09:31 -0700
From: Andrew Nikitin
Date: 2016 Oct 17, 09:31 -0700
> I'm trying to build a planisphere for my lattitude (60°N)
Tony, I assume you need an altitude/azimuth grid for your latitude in azimuthal equidistant projection. In my own planisphere project I found that it is easiest to split each line of altitude in 1000 or so parts, calculate plane coordinates of each point using magic formula* and connect the dots of the result wit short straight lines. You can see my results at http://fer3.com/arc/m2.aspx/Azimuthal-equidistant-grid-Nikitin-sep-2009-g9992
*I took formulas for the altitude/azimuth grid projection from wikipedia page, but I am sure there are more reputable sources
https://en.wikipedia.org/wiki/Azimuthal_equidistant_projection
