A rare phenomenon known as a “Blood Moon” occurred on March 2025, when the full moon took on shades of red, orange, and yellow during a total lunar eclipse. The event was visible to people in the Americas and Western Hemisphere, and was dubbed the “Worm Moon” by the Farmer’s Almanac.
A total lunar eclipse happens when the sun, Earth, and moon align in that order, causing long wavelengths of sunlight to be refracted through the atmosphere before reaching the moon. This filters out shorter wavelengths like blue, allowing longer wavelengths such as red, orange, and yellow to dominate the moon’s appearance.
As the moon passes through the shadow of the Earth, it takes on a reddish hue, becoming more pronounced as it enters the darkest part of the shadow. The “Blood Moon” is caused by this alignment and the way that sunlight interacts with the Earth’s atmosphere.
Source: https://www.cbsnews.com/news/what-causes-blood-moon