This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
lunar eclipse occurs on a full moon night.the earth revolves around the sun and the moon rotates around the earth.a time comes when the sun , the earth and the moon comes in one straight this point of time the moon cannot be seen because of the shadow caused by the earth which falls on the moon doesn't have its own light , it is not visible.
the sun in present first , then comes the  earth and at last is the moon.this is the position.
1 5 1
hope it helps..........plz mark my answer as the best.......
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the Sun, Earth, and Moon are aligned (in "syzygy") exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a full moon.