The axis of earth is an imaginary line which makes an angle _______ with its orbital surface.

The axis of the Earth, which is an imaginary line, makes an angle of 66½° with its orbital plane.

Important Points

• The angle Earth’s axis is tilted with respect to Earth’s orbital plane, known as obliquity.
• The tilt of the Earth's axis from the plane of its orbit around the sun is 23.5 degrees.
• The tilt of the axis changes between 22.1 and 24.5 degrees throughout a period of around 40,000 years.
• The ecliptic plane is the Earth's orbital plane, and astronomers use the term obliquity to describe its tilt.

Here the diagram clearly demonstrate the tilt of the Earth's axis is 23.30º or 23½º while the ecliptic plane that is the Earth's orbital plane is 66.30º or 66½º

Additional Information

• Earth's Axis Is Imaginary, an axis refers to the imaginary line that an object, usually a planet, rotates around. Earth's rotational axis is an imaginary straight line that runs through the North and South Pole.
• An orbital plane is the flat, disk-shaped space that connects the center of the object being orbited with the center of the orbiting objects. Because all planets in our solar system share a similar orbital plane, planets don’t run into each other.