Green Flash, Real?
Green flashes and green rays are optical phenomena that sometimes occur right after sunset or right before sunrise. When the conditions are right, a green spot is visible above the upper rim of the disk of the sun. The green appearance usually lasts for no more than a second or two. Rarely, the green flash can resemble a green ray shooting up from the sunset (or sunrise) point. Green flashes occur because the atmosphere can cause the light from the sun to separate out into different colors. Green flashes are a group of phenomena which stem from slightly different causes, and therefore some types of green flashes are more common than others.
So, next time you are watching a clear sunset, one where there are no clouds between you and the sun setting over the horizon, look carefully for the Green Flash right before the last part of the sun sets. Here in Hawaii, since we are so close to the equator, the Green Flash can be seen for less than a second. My suggestion is to look away right before it happens so that your eyes are not getting burnt out watching the bright part of the sun. Then, look up right before it happens. Hope you get to see one soon!