The green flash is a rare optical phenomenon that occurs shortly after sunset or before sunrise. It happens when the atmosphere separates or refracts different colors of sunlight. Blue and violet light are scattered away, leaving the green light visible for a brief moment.
The best conditions to see a green flash include:
- A clear horizon, typically over an ocean
- Clean, clear air with no pollution or haze
- An unobstructed view of the sunset/sunrise
- Good atmospheric conditions with minimal turbulence
The phenomenon typically lasts only 1-2 seconds, making it particularly challenging to observe and photograph.