That isn\'t quite correct. It works perfectly at zero inclination, but fails otherwise due to mixing of angle mixing. What you really want is effectively the current sidereal time, as that is the coordinate system that LAN is measured against. A more complete answer would be: Local Sidereal Time = Current Orbital Longitude = LAN + Arctan[ tan( tA + APe ) * cos(i) ] Where: tA = True Anomaly APe = Argument of Periapsis i = Inclination Of course, in KSP you have a lot easier ways to do this, as you always have the local latitude relative to the celestial body\'s surface, and the celestial body\'s surface relative position to the stars, so you can just do: Local Sidereal Longitude = surface longitude + vessel.orbit.referenceBody.rotationAngle Hope that helps with your orbital maneuvers!
