Green Flash

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Green Flash

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A brilliant green coloring of the upper edge of the sun as it appears at sunrise or disappears at sunset when there is a clear, distinct horizon. </dd>
The green flash is due to refraction by the atmosphere, which disperses the first (or last) spot of light into a spectrum. The green is bent more than red or yellow and hence is visible sooner at sunrise and later at sunset. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use