The blue hour is a natural color phenomenon that occurs during twilight, both before sunrise and after sunset. During this time, the sky takes on a distinctly deep blue color with soft, diffused light that creates magical atmospheric conditions.
This phenomenon occurs because:
- The sun is between 4 and 8 degrees below the horizon
- Blue light waves scatter more easily through the atmosphere
- Red light passes straight into space
- Artificial lights begin to balance with natural light
The blue hour is particularly valued by photographers and artists for its unique lighting qualities. Despite its name, it typically lasts only 20-30 minutes. The effect is most pronounced in clear weather and urban environments where artificial lighting enhances the blue tones. This phenomenon is different from the ‘golden hour’ that occurs closer to sunset or sunrise.