During a lunar eclipse, the penumbra is the outer part of the Earth's shadow that partially covers the Moon. It is a grayish shadow where sunlight is only partially blocked by the Earth. The penumbra is less dense and darker than the umbral shadow, which is the inner, darker part of the Earth's shadow that totally covers the Moon during a total lunar eclipse.
During a lunar eclipse, the penumbra refers to the outer part of the Earth's shadow that is cast on the Moon. It is a region where only a portion of the Sun's light is blocked, resulting in a partial shadow. The penumbra is less dark compared to the umbra, which is the innermost part of the shadow where all direct sunlight is blocked. In a penumbral lunar eclipse, the Moon passes through the Earth's penumbra, resulting in a subtle dimming or shading of the Moon's surface rather than a distinct red colorization seen in a total lunar eclipse.
