During which phase does a lunar eclipse occur?

A lunar eclipse occurs during the full moon phase. This is when the Earth is positioned directly between the Sun and the Moon, causing the Earth's shadow to fall on the Moon. The alignment of the Sun, Earth, and Moon is crucial for a lunar eclipse, and it can only happen when the Moon is full because that is when it is on the opposite side of the Earth from the Sun. During a full moon, the Moon reflects the sunlight, and if the Earth comes directly in line with the Sun and Moon, the shadow created by the Earth obscures all or a portion of the Moon. This alignment does not occur during the new moon or quarter phases, as the positions of the Sun, Earth, and Moon are not aligned in a way that causes an eclipse.