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A “blood moon” happens when Earth’s moon is in a total lunar eclipse. The view in the sky is usually a white moon and becomes red or ruddy-brown. The moon orbits around Earth, while Earth orbits around the sun. The moon takes about 27 days to orbit Earth and goes through regular phases in a 29.5-day cycle.

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During a full eclipses, the moon is fully in Earth’s shadow. Lunar Eclipse can only happen during a full moon, when the sun fully illuminates the surface. Earth passes in between the moon and the sun and cuts off the sunlight, causing an eclipse. If Earth partially blocks the sun and the darkest part of it’s shadow falls across the moon’s surface.

Info Courtesy of:info