I am working on a project that involves mapping the night sky's northern hemisphere onto the exterior surface of a small (16 cm radius) geodesic dome. The problem is, I don't know what map projection to convert to, or whether I need to create one. If so, I don't really know how.

I'm starting from a high-resolution image of the full night sky in an equirectangular projection in celestial coordinates.

One of the equirectangular images I would like to project onto the geodesic net

I would like to map that onto the net of a geodesic dome, geodesic dome net so that I can construct the dome with accurate star coordinates. I would like to use a computer program to convert the northern hemisphere of my equirectangular star map into the desired projection, if possible.

  • 1
    Can you provide a link to the source data along with the projection information? – RoperMaps Mar 30 '19 at 8:00
  • @RoperMaps Done! – Rúnatál Davino Mar 30 '19 at 16:27
  • I don't know of anything that will do it 'out the box' so to speak. However I would start by looking at the D3 geo-projections library. Specifically: github.com/d3/d3-geo-projection#polyhedral-projections . I would probably start out by duplicating your net so you have a 'sphere' and then projecting the whole map on that and then tweaking it till the N Hemisphere is in the right place. This might be quite an undertaking though! – RoperMaps Apr 1 '19 at 8:13

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