For many years now I've been using Voyager sky simulator by Carinasoft. The projection selections are great, but Equirectangular doesn't seem to one one of them. Is there a program out there that does this? I cooked up an Excel sheet to do the coordinate conversions, and I can import these into Autocad if I have to, but it seems like there should be an off-the-shelf package to do this.

For my current project I need to be able to show a 360 degree overview of changes due to precession from 3000-2000-1000 BC at a glance. It may be my familiarity with the typical simple projection published for surveyors in a standard Ephemeris before the internet and GPS all but eliminated the demand for such publications.

  • 1
    $\begingroup$ Not sure if it helps, but for equirectangular just map RA = x and dec = y $\endgroup$
    – James K
    Jul 9, 2017 at 19:18

1 Answer 1


The "cylinder" projection of Stellarium does this:

enter image description here

  • $\begingroup$ Thank you very much, I'll try it. I see the date you used is today's. Have you experimented with a few thousand years BCE? $\endgroup$ Jul 10, 2017 at 19:53
  • $\begingroup$ I haven't, but Stellarium does handle precession and nutation, so it should work properly for dates in the distant past/future $\endgroup$
    – user21
    Jul 11, 2017 at 15:10

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .