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How These Maps Were Made
It started with Winchell Chung's excellent Project Rho site. I was surprised that amongst the many star maps of fictional universes that he displayed, Dune wasn't amongst them. I assumed that because Dune was so popular and that several planets in the Dune universe were described as orbiting known stars, someone somewhere must have produced a map.
A search of the web failed to turn up any maps, but I did find a copy of The Dune Gazeteer by Joseph M. Daniels posted on a Dune forum. Daniels goes to some lengths to identify all the major planets of the Dune universe with actual stars. If anyone knows how to contact Joseph Daniels, please email me at firstname.lastname@example.org
In order to produce co-ordinates from which I could produce a map, I plugged the data for the actual stars that Daniels identified into a copy of an Excel spreadsheet that I downloaded from the Project Rho site. There was no correction for proper motion over the next few millennia; life is too short for some things. The maps on this site are largely based on Daniels work, with two exceptions, which are described on the spreadsheet.
To produce the maps, the data from this spreadsheet was plugged into the CHView program. This program is freeware and an excellent tool for producing star maps for gaming. The data file for the maps is called Dune.chv. If you download a copy of CHView and load the Dune.chv file, you can view the stars in 3D. The maps posted on this page were created by taking screen shots of CHView and adding some annotation.
It may seem surprising that although the Dune Imperium is supposed to span thousands if not millions of planets, most of the major worlds lie within a few hundred light years of Earth. This can be rationalized, as it seems a fair assumption that the habitable worlds close to Earth were the ones colonized first, and that therefore they had the longest available time in which to build a political power base. The real reason is of course that Herbert was using named stars, and these tend to be the stars that have been known to astronomers longest and are therefore most prominent in the sky and closest to Earth.
When I loaded the data into CHView, it was immediately apparent that there was a tight group of planets immediately surrounding Earth which would be impossible to display clearly at the same time as the rest of the stars on the map. This is why the "Old Earth Cluster" has a separate map. The name "Old Earth Cluster" is my invention.
The maps can now also be seen on the Project Rho site which started it all.