You're right to question that! It's not true that there is a lunar eclipse during every full moon.

Here's why:

* Lunar eclipses happen when the Earth is positioned directly between the Sun and the Moon. This means the Earth's shadow falls on the Moon, blocking sunlight from reaching it.

* A full moon occurs when the Moon is on the opposite side of the Earth from the Sun. This alignment is necessary for a full moon, but it doesn't guarantee an eclipse.

* The Moon's orbit is slightly tilted compared to Earth's orbit around the Sun. This means that during most full moons, the Moon passes above or below Earth's shadow, and no eclipse occurs.

So, to have a lunar eclipse, the following conditions must be met:

1. It must be a full moon.

2. The Moon must be passing through the Earth's shadow.

This alignment doesn't happen every full moon, which is why lunar eclipses are not that frequent.