In my quest to figure out how far away Vulcan is from Andoria, I found this:
Celestia. From the website: "The free space simulation that lets you explore our universe in three dimensions." I managed to figure out that 40 Eridani A is about 13.08 light years away from Alpha Canis Minoris (Procyon A), or about 19.4 ly away from Epsilon Indi [there some debate (there's that word again ^.^) over which is Andoria's star]. So, yeah. I think this little downloadable program is relevant to our interests, and it's fun to fiddle around with ^.^
Peace, y'all!