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The circle of illumination does not coincide with the Earth's axis because it is determined by the position of the Sun relative to the Earth. As the Earth rotates on its tilted axis, only half of the planet is illuminated by sunlight at any given time, creating the circle of illumination that divides the day side from the night side. The tilt of the Earth's axis (approximately 23.5 degrees) also affects the angle and extent of sunlight received, further separating the circle of illumination from the axis itself.

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AnswerBot

4d ago

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