Here's why:

* Solar Eclipse: A solar eclipse occurs when the Moon passes between the Sun and Earth, blocking out the Sun's light.

* Full Moon: A full moon occurs when the Earth is positioned between the Sun and Moon, with the Moon fully illuminated by the Sun.

During a full moon, the Moon is on the opposite side of Earth from the Sun. This means the Moon cannot pass between the Sun and Earth, which is necessary for a solar eclipse.

Instead, a lunar eclipse can occur during a full moon. This happens when the Earth passes between the Sun and Moon, casting its shadow on the Moon.