Question

define circle of illumination​

Answer 1

circle of illumination is the division of day and night over the earth . It is the line that separates light from darkness.

Hope this helps

Answer 2

Answer:

it is the line that sepretes light from dark .

Explanation:

if you see there is a line that sepreats the the lightned half from the darkend half of the Earth. This is line of illumination.