During a lunar eclipse, which phase of the Moon typically corresponds to the Earth casting its umbral shadow on the Moon?

During a lunar eclipse the Moon is in the full‑moon phase, meaning it is opposite the Sun and fully illuminated from Earth’s view. At that time the Moon passes through the Earth’s umbral shadow, producing a darkening or reddish tint. The geometry requires the Sun, Earth, and Moon to be almost perfectly aligned, which only occurs at full moon. For example, when the Moon is full, you can see it turn a reddish color as it goes through Earth’s shadow. Thus, a lunar eclipse happens only when the Moon is full.