In photography, the Blue Hour refers to a period in the morning or evening when the sky is illuminated in various shades of blue. This occurs when the sun is just below the horizon, but its indirect light still brightens the sky. The Blue Hour is a very popular time for photographers because the light during this period is particularly soft and warm, and the sky glows in different shades of blue. The colors and light create a unique atmosphere that is often perceived as calming and inspiring.

It typically lasts about 20 to 30 minutes, making it a relatively short window of time. It is important to plan the exact timing in advance and arrive at the desired location in good time to achieve the best results. Photographers often use the Blue Hour to capture landscape photos, architectural shots, cityscapes, or portraits. By using tripods and slow shutter speeds, they can also create stunning long-exposure shots that make the sky appear even more intensely blue.