A "Green Flash" Sunset: Gone in 60 Seconds | Earth-Sun Science
One minute sunset with multiple “green flashes.” Location: Big Island, Hawaii, USA
Witnessing green flashes at sunset is a rare event that many Sun watchers pride themselves on having seen. Once thought to be a myth, green flashes are now understood to occur when the Earth's atmosphere acts like a prism and a lens. Atmospheric layers create altitude-variable refractions that take light from the top of the Sun, dispersing its colors, creating multiple images, and magnifying it in just the right way to make thin slivers appear green, just before it disappears.
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