A total lunar eclipse is set to occur on March 13-14, 2025, casting the moon in a deep red hue observable from the Western Hemisphere. This unique phenomenon arises when the Earth places itself directly between the sun and the moon, casting its shadow on the lunar surface. The eclipse is a rare opportunity for sky watchers, with the reddish appearance of the moon resulting from Rayleigh scattering of sunlight through the Earth's atmosphere, allowing only the longer wavelengths to reach the moon.
During a total lunar eclipse, the moon turns red or orange as sunlight passing through the Earth's atmosphere scatters and colors the moon’s surface.
The only sunlight that reaches the moon during an eclipse has to pass through the Earth's atmosphere, where Rayleigh scattering prioritizes longer wavelengths.
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