Crepuscular Rays

light · sky · weather · optical illusions

Sunlight through gaps. Crepuscular rays happen when the sun shines through openings in clouds, creating visible beams of light that look like glowing pillars falling from the sky.

Best at twilight. You see them most clearly during sunrise or sunset when the sun is low on the horizon and the contrast between bright light and dark clouds is strongest.

A visual trick. These rays aren't actually solid shafts of light, they're shadows cast by clouds with bright sky between them, making your brain perceive the light beams.

Many cool names. People call them god rays, Jacob's ladder, or twilight rays because they look so magical and otherworldly as they stream across the sky.

The word crepuscular. It comes from the Latin word 'crepusculum' which simply means 'twilight,' so crepuscular rays are literally rays of twilight.