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I'm developing a planetarium software and I need the R.A. and DEC that represents every constellation area in the sky. I think I only need R.A. and DEC for each vertex.

Where can I find it?

I'm searching on Internet and I can't find it. Maybe because I'm not doing the right search.

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    $\begingroup$ I think is here: iau.org/public/themes/constellations. There is a TXT for each constellation with vertex's R.A. and DEC. $\endgroup$
    – VansFannel
    May 29, 2016 at 15:52
  • $\begingroup$ That should be expanded into an answer. $\endgroup$
    – James K
    May 31, 2016 at 16:48

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James Kilfiger has suggested me to expand my comment as answer, and here it is:

Searching I have found the data in the international astronomical union website. In http://iau.org/public/themes/constellations you can find a TXT for each constellation with vertex's R.A. and DEC.

At the end of that page there is an explanation about the fields on that text files. Their coordinates are J2000.

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They are defined on the coordinate grid of 1875; precession has shifted and rotated them since then, and a map for the present epoch must account for that. In addition to the vertices, you may need to interpolate a few points along the edges. Davenhall and Leggett 1989 provide boundary coordinates for epochs 1875 and 2000. For determining which constellation contains a given point, Roman 1987 provides regions and lookup code.

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