At around 40 degrees north and south, for example in New York and Wellington, it takes around 20 minutes in March. For example, in Quito, Ecuador, which is very close to the equator, it takes the Sun only about 16 minutes to move from 8 to 4 degrees below the horizon.Īt higher latitudes, the same process takes longer. In locations where the Sun is directly overhead at noon-for example at the equator during the equinoxes-the Sun traverses the horizon at an angle of 90°, making for swift transitions between night and day and a relatively short blue hour. The duration of the blue hour depends on both the latitude and the season. This is different to the scattering process that produces a blue sky during the day. The distinctive color of the sky during the blue hour comes from red light being absorbed by ozone in the upper atmosphere. As the solar elevation angle-the angle of the Sun above or below the horizon-changes during the transition between day and night, different wavelengths are filtered out by the Earth's atmosphere, leaving the remaining rays of light to color the sky in ever-changing hues. The different colors of twilight are created by atmospheric effects. The Sun's angle in your city-click on the table Why Is the Light Blue? By this definition, the blue hour encompasses parts of both nautical twilight and civil twilight. However, the blue color spectrum is most likely to emerge when the Sun is between 4 and 8 degrees below the horizon. Rather, it refers to a state of natural lighting that usually occurs at daybreak in the morning and during the last stages of twilight in the evening. The blue hour refers to the phase of twilight when the Sun is so far below the horizon that the light's blue wavelengths dominate.īecause the blue hour is a colloquial term, it doesn't have an official definition similar to dawn, dusk, and the 3 phases of twilight. On a clear day, the transition between day and night can be a colorful spectacle, with the indirect sunlight tinting the sky yellow, orange, red, and blue. The moments when 99% of people see sunlight Definition of the Blue Hour The contrast between the deep blue sky and the glow of artificial light sources makes the blue hour an ideal time for urban photography. Business Date to Date (exclude holidays).
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