A lunar eclipse photographed on Oct. 8, 2014. Credit: NASA
During a lunar eclipse, Earth comes between the Sun and the Moon, blocking the sunlight falling on the Moon.
During some stages of a lunar eclipse, the Moon can appear reddish. This is because the only remaining sunlight reaching the Moon at that point is from around the edges of the Earth, as seen from the Moon's surface. From there, an observer during an eclipse would see all Earth's sunrises and sunsets at once.