You fly a small cargo tug around a pocket-sized Earth, and the physics are real. Thrust the way you are going and the far side of your orbit rises. Thrust backwards and you fall into a lower, faster orbit. To catch something ahead of you, you slow down.
WS prograde / retrograde · AD radial in / out · M match · F approach · hold Shift for fine thrust ,. time warp · ZXC warp to Ap / Pe / closest · Space pause · V camera · scroll to zoom · click a station to target it