I'm trying to do a programmed landing with Remote Tech in Minmus in preparation for a landig with delay. I use the VisViva equation and the gravitational potential energy equation. The Delta-V that has to be burnt is correct but the time to burn is always like 1 minute before it should. Can anyone help me? GM = Gravitational parameter = 1.7658*10^9 Radius of planet (m) = 60,000 Periapsis (m) = 20,700 Terrain height (m) = 0 r1 =20,700 + 60,000 = 80,700 r2 = 60,000 v2 = 2 * ( -1.7658*10^9 / 80,700 + 1.7658*10^9 / 60,000 ) v2 = 15097,9182 v = sqrt(15097,9182) v = 122,874 m/s (final velocity) average velocity = 122.874 /2 = 61,437 fall distance = periapsis - terrain height = 20,700 fall distance / average speed =20,700 m / 61.437 m/s = 336.931 seconds acceleration of craft = 12.61 m/s^2 Time to cancel final velocity = 122.874 m/s / 12.61 m/s^2 = 9.744 seconds Start burn at 336.931 seconds - 9.744 seconds = 327.187 seconds from start, burn for 9.744 seconds I know I can use LanderTron rockets, and I have them in my lander, but I don't want to use them because the lack the sense of acomplishment.