Question

define circle illumination​

Answer 1

Answer:

Circle of illumination is an imaginary line that separates light from darkness and day from night. Earth's axis refers to a imaginary line going through the center of the Earth from top to bottom.

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Answer 2

$\underline{ \sf \green{ANSWER-}}$

Circle of illumination is the great circle that divides the globe at all times into a sunlit hemisphere and shadowed hemisphere.