Multiple choice A solar eclipse occurs when _____________. The shadow of the Earth blocks the Sun completely. The shadow of the Moon blocks the Sun completely. The shadow of the Earth blocks the Moon completely. The shadow of the Sun blocks the Moon completely. The shadow of the Sun blocks the Earth completely. Reveal answer Fill a bubble to check yourself B Correct answer Explanation At the time of an eclipse the sun the Moon and the Earth are in a straight line with the Moon between the Earth and the Sun. When the Moon blocks all the light from the Sun it is called a solar eclipse.