03-21-2016, 04:15 AM
If you've already established Cartesian (XYZ) coordinates for the systems, then you can simply apply the 3D distance formula, being the square root of (x2-x1)^2 + (y2-y1)^2 + (z2-z1)^2. The units will be in whatever you chose for the Cartesian coordinates (meters, feet, AU, light years, parsecs, or whatever). Trigonometry is not required.
Radtech497
Radtech497
"I'd much rather see you on my side, than scattered into... atoms." Ming the Merciless, Ruler of the Universe