The axis of the earth is stated to be inclined at an angle of 66°. With respect to which of the following does the axis of the earth form this angle?

Correct option is C

The correct answer is (c) Plane of Ecliptic.
The Earth's axis is inclined at an angle of approximately 66.5° with respect to the plane of the ecliptic, which is the imaginary plane created by Earth's orbit around the Sun. This tilt, also described as an axial tilt or obliquity, is essential in creating the seasonal variations experienced on Earth. The angle of inclination causes different parts of the Earth to receive varying amounts of sunlight throughout the year, leading to the four distinct seasons. The Earth's axial tilt of 23.5° relative to a perpendicular to the ecliptic plane (90° - 23.5° = 66.5°) results in this inclination.
Information Booster:
· (a) The Equator: The Equator is the imaginary line dividing the Earth into the Northern and Southern Hemispheres, but the 66.5° tilt is measured with respect to the plane of the ecliptic, not the Equator.
· (b) Tropic of Cancer: The Tropic of Cancer is located at approximately 23.5° North latitude, but it does not determine the Earth's axial tilt angle.
· (c) Plane of Ecliptic: This is the correct reference plane, created by Earth's orbit around the Sun, with respect to which the Earth's axis is tilted.
· (d) Arctic Circle: The Arctic Circle is situated at approximately 66.5° North latitude, marking the boundary where polar day and night phenomena occur, but it is not the reference for Earth’s axial tilt.