As the Earth rotates on its axis, the side facing the sun is in daylight and the side away from the Sun is in darkness
(the Earth; rotates; L:on its axis) (the side; facing; the sun) (the side facing the sun; is; in daylight) (the side away from the Sun; is; in darkness)
the Earth the side the side facing the sun the side away from the Sun
rotates facing is is
L:on its axis
the sun
in daylight
in darkness