Green flashes are real phenomena seen at sunrise and sunset, when part of the sun suddenly changes color.

Green flashes usually are brief, lasting only one or two seconds.

Green flashes do not always light up the sky, but are often small and inconspicuous.

To see green flashes, you must be in the right place. An ocean horizon can often provide optimum green flash viewing conditions.

To see green flashes, the air should be reasonably clear.

To see green flashes you should use an optical aid, such as binoculars.

For more info on green flashes go to: http://mintaka.sdsu.edu/GF/