Lunar eclipse
Sign in to saveA lunar eclipse, also called a blood moon, is an astronomical event that occurs when the Moon orbits through Earth's shadow. Lunar eclipses occur during eclipse season, when the Moon's orbital plane is approximately in line with Earth and the Sun. The type and length of a lunar eclipse depend on the Moon's proximity to the lunar node.
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A lunar eclipse occurs when the Moon passes through Earth's shadow as it orbits around our planet, sometimes appearing reddish and earning the nickname "blood moon." These events happen during specific times called eclipse seasons when the Moon's orbit aligns with Earth and the Sun, and the exact type and duration of the eclipse depends on how close the Moon is to certain points in its orbital path.
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Composite image of the April 2014 total lunar eclipse as viewed from Charleston, West VirginiaA schematic diagram of the shadow cast by Earth. Within the umbra, the central region, the planet totally shields direct sunlight. In contrast, within the penumbra, the outer portion, the sunlight is only partially blocked. Sun, Moon, and Earth sizes and distances between them not to scale. A lunar eclipse, also called a blood moon, is an astronomical event that occurs when the Moon orbits through Earth's shadow. Lunar eclipses occur during eclipse season, when the Moon's orbital plane is approximately in line with Earth and the Sun. The type and length of a lunar eclipse depend on the Moon's proximity to the lunar node.
In contrast with elusive and short-lasting solar eclipses, lunar eclipses can be observed from anywhere on the night side of Earth and often last for an hour or longer. Lunar eclipses are safe to observe without eye protection.