Question

what is known as the orbital plane​

Answer 1

Answer:

All of the planets, comets, and asteroids in the solar system are in orbit around the Sun. All of those orbits line up with each other making a kind of flat disk called the orbital plane.

The planets all orbit on or near one plane in space like the picture above. They do not orbit at all angles, as below.

Answer 2

Answer: The orbital plane of a revolving body is the geometric plane in which its orbit lies.

Three non collinear points in space suffice to determine an orbital plane.A common example would be the positions of the centres of a massive body and of an orbiting celestial body at two different times/points of its orbit.

Hope it helpful............