Astronomy Picture of the Day



Movie: A Green Flash Over Italy

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#98552 by @ 30.01.2007 00:00 - nach oben -
Movie: A Green Flash Over Italy


Explanation:
How could the Sun turn green?

Difficult to observe, the momentary
green flash above the rising or setting sun
has been documented as
a phenomenon caused by the atmospheric bending or refraction of sunlight.

Like a weak
prism,
the Earth's atmosphere breaks white sunlight into colors, bending red colors slightly and green and blue colors
through increasingly larger angles.

When the sky is clear, a green flash just above the sun's edge can sometimes be
seen for a second or so,
when the sun is close to a distant horizon.

Still, from a site atop
Mt. Autore (altitude 1,850 meters) in Italy
astrophotographer Danilo Pivato captured
this dramatic green flash movie.

The time between frames varies from over one minute in the beginning to about one second as the flash becomes visible.




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