The main Frequently Asked Questions are here
You may ask other questions in this thread.
It is the old link, the new link is here (http://spaceengine.org/manual/faq/).
RA/Dec/Dist to xyz:
x = Dist * cos(Dec) * sin(RA);
y = Dist * sin(Dec);
z = Dist * cos(Dec) * cos(RA);
Dist = sqrt(x*x + y*y + z*z);
Dec = asin(y / Dist);
RA = atan2(x, z);
if (RA >= 2*pi) RA = RA - pi/2;
if (RA < 0) RA = RA + pi/2;
Sorry but I don't know for find xyz with the equatorial coordinate grid : And if I use the AbsPosition (in save-user.cfg), I have this error : ValueError: math domain error.
Too bad , I would have tried, I hope it will be corrected in the next version.Regarding to you question, you can't place a black hole in the exact center of the galaxy using RA/Dec/Dist, because coordinates are stored in fp32 format internally. This mean that they has only 8-9 digits precision. You may type many digits in the script (like RA 3.4681313548866251), but only 8-9 first digits will be used.Hexadecimal format has a 3-millimeter precision across the entire Universe, but it is used only for camera.
I know but isn't precise.
Even if we can not set for 3 mm at the moment, for a future version, I would already have the converter Unless you plan a new way to place objects, - of course keeping the current one - due to :
StarBarycenter "Proxima System"
{
AbsPosition (-00000000000000005CF7B4EA659695D7, -00000000000000012819D403B042F965, -00000000000000007978254DF318A650) //Universal position
}
StarBarycenter "Sagittarius system"
{
RefBody "Milkay Way"
RelPosition (0, 0, 0) //Position relative to the RefBody
}
Steam version will get more frequent updates, access to betas, and some other stuff. Main version releases will be released on both sites, but Steam version will most likely be sold to help fund further development.