20 Rare Weather Events Caught Defying the Sky

At the precise instant the sun dips below the horizon, its final ray refracts into emerald light — a phenomenon caused by atmospheric dispersion. Photographers chase it like myth; sailors once took it as a sign of fate. The flash lasts barely two seconds, but those who see it speak of time slowing — of witnessing the spectrum’s ghost at

the edge of day. It occurs only when the air is exceptionally clear and temperature gradients bend light like glass.