Question

Why don't we see a lunar eclipse every time there is a full moon?

Answer 1

A lunar eclipse happens when Earth is between the Sun and the Moon, which is a true statement about them.

When there is a lunar eclipse, the moon moves into a position where it will be in the Earth's shadow and will not be visible. This means that because the Earth sits between the sun and the moon, a shadow forms, and when the moon moves behind the Earth, the Earth prevents the moon from receiving light from the sun. If the eclipse is a total lunar eclipse, the Moon will spend roughly two hours traveling through the umbra (region of total shadow) cast by Earth. When the Moon merely passes through a portion of Earth's umbra or penumbra, a partial eclipse of the Moon occurs.

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