Green flashes and green rays are optical phenomena that occur shortly after sunset or before sunrise, when a green spot is visible for a short period of time above the sun, or a green ray shoots up from the sunset point.
green flash
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green flash: an atmospheric phenomenon occasionally observed during the final phase of sunset, when the upper limb of the sun shows as a green flash due to the complex wavelength-dependence of atmospheric refraction.
GREEN FLASH
Sometimes, at sunrise or sunset, there are flashes of green light visible near the sun. This effect only happens when there are no clouds nearb the sun.
or green flash, faint band of light sometimes seen in the western sky just after sunset, extending up from the horizon at the point where the sun has just set.
green flash (NASA SP-7, 1965) 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.
It's a green flash from the Sun. The truth is the green flash does exist and its cause is well understood. Just as the setting Sun disappears completely from view, a last glimmer appears startlingly green.
Was that a green flash? I think you were imagining it. What perfect dark skies. Absolutely beautiful. Is that the zodiacal light? I think it is! May I borrow your binoculars? They're opening up the visitor center 16-inch now.
Babcock's Dynamo Hypothesis, Carrington Rotation Number, Chromosphere, Circumzenithal Arc, Civil Twilight, Conjunction, Corona, Crepuscular Ray, Day, Eclipse, Elongation, Equinox, Faculae, Faint Early Sun Paradox, First Point in Aries, Green Flash, ...
 See also: Light, Solar, Sunset, Time, Astronomy
  
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