An object must be at both foci of an elliptical orbit. All the planets move in their orbits with the same speed. No work is done on orbiting planets by the sun. The orbits of the planets lie precisely in the same plane. All the planets revolve about sun with the same period.
Revolution is the same as rotation.
Spacecraft can be launched anytime to travel from one planet to another. Spacecraft are not affected by the sun. Motion relative to Earth is same as motion relative to the sun. Jets can fly in space. Spacecraft in orbit about Earth don't follow a sinusoidal path relative to the sun.