A Green Flash Italy

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 green flash.