Question

when does a lunar eclipse occur? How does it occur?

Answer 1

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 occur only the night of a full moon.

Lunar eclipses occur when Earth's shadow blocks the sun's light, which otherwise reflects off the moon. There are three types — total, partial and penumbral .

Answer 2

lunar eclipse occurs when earth came between sun and moon. so earth's shadow covers sun light and moon get dark. This phenomenon is called lunar eclipse.