kOS.Suffixed.VesselTarget.GetPositionAtUT C# (CSharp) Method

        public override Vector GetPositionAtUT(TimeSpan timeStamp)
        {
            string blockingTech;
            if (!Career.CanMakeNodes(out blockingTech))
                throw new KOSLowTechException("use POSITIONAT on a vessel", blockingTech);

            double desiredUT = timeStamp.ToUnixStyleTime();

            Orbit patch = GetOrbitAtUT(desiredUT);
            Vector3d pos = patch.getPositionAtUT(desiredUT);

            // This is an ugly workaround to fix what is probably a bug in KSP's API:
            // If looking at a future orbit patch around a child body of the current body, then
            // the various get{Thingy}AtUT() methods return numbers calculated incorrectly as
            // if the child body was going to remain stationary where it is now, rather than
            // taking into account where it will be later when the intercept happens.
            // This corrects for that case:
            if (Utils.BodyOrbitsBody(patch.referenceBody, Vessel.orbit.referenceBody))
            {
                Vector3d futureSOIPosNow = patch.referenceBody.position;
                Vector3d futureSOIPosLater = patch.referenceBody.getPositionAtUT(desiredUT);
                Vector3d offset = futureSOIPosLater - futureSOIPosNow;
                pos = pos + offset;
            }

            return new Vector(pos - Shared.Vessel.CoMD); // Convert to ship-centered frame.
        }