Question

what is the circle of illumination?​

Answer 1

Answer:

The imaginary line that separates day from night on earth is called the circle of illumination. It is basically the region that is experiencing sunshine. The circle of illumination cuts all latitudes into half on the spring and autumnal equinoxes.

Answer 2

Answer:

The imaginary line which divides the part of the earth with day and night is called the circle of illumination. The circle of illumination is at right angle to the orbital plane. Thus, the circle of illumination is at an angle of 23.5o to the earth axis.

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