Richard was studying a computer simulation of the Earth's rotational motion. He observed that Earth's axis was inclined at an angle in relation to its plane of orbit around the Sun. How would Richard ideally define this inclination of the Earth's axis?

The earth is tilted at an angle of 23.5 degrees in relation ti its orbital plane. The orbital plane is the plane of earth's orbit around the sun. The tilt of the axis is also referred to as its obliquity. The tilt in the angle is responsible for seasons as is turns hemispheres away from or towards the sun at different times of the year.