For every Hohmann transfer to or from another celestial body's orbit, there is an optimal altitude to start from. For instance if you start a Hohmann burn from Kerbin to Eve at 12,908km, you'll save about 500m/s relative to starting from a 100km orbit. I thought this information might be useful for planning refueling station altitudes.
- no inclination changes
- eccentric orbits are assumed circular with radius equal to the semi-major axis
- All values in