Anders, where did you receive your education in orbital mechanics? How much did you spend for that degree?
In Sweden until 1971! I paid SEK 0:- for it. The mechanical engineering education I got was very good. Kept me busy all my life.
But topic is about orbits in space.
I didn't ask you about your mechanical engineering education. Where did you receive your orbital mechanics education? Do you honestly think that you know everything there is to know about orbital mechanics?
As far as I am concerned
orbital mechanics is about spacecraft trajectories, including orbital maneuvers, orbital plane changes, and interplanetary transfers, and is used by mission planners to predict the results of propulsive maneuvers in space.
Orbits are elliptical, with the heavier body (a star/sun/planet/moon) at one focus of the ellipse and the spacecraft moving around the star/sun/planet/moon. A special case of this is a circular orbit (a circle is a special case of ellipse) with the star/sun/planet/moon at the center and the spacecraft flying around.
There is no way that a spacecraft can jump from one orbit to another, I have been taught. You sound like suffering from cognitive dissonance. Do you really suggest that a spacecraft can leave one orbit around a star/sun/planet/moon and start an orbit around another star/sun/planet/moon?