Seasonal variation on Earth is due to the:

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Tilt of the Earth’s axis of rotation.
Tilt of the Earth’s axis of rotation.

Elliptical path the Sun takes around the Earth.
Elliptical path the Sun takes around the Earth.

Revolution of Earth on its axis.
Revolution of Earth on its axis.

Distance of Earth from the sun at any given time.

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Tilt of the Earth’s axis of rotation.