Source: wikibot/green-flash
= Green flash
{wiki=Green_flash}
The "green flash" is a rare optical phenomenon that occurs just before sunrise or just after sunset. It is characterized by a brief flash of green light that appears above the upper rim of the sun, lasting only a few seconds. The phenomenon is caused by the refraction of sunlight in the Earth's atmosphere, which can cause the sunlight to bend and separate into its component colors.