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Dusk definition twilight3/28/2024 ![]() ![]() The variety of how long twilight lasts can. Because of this, there are two moments of twilight each day. It’s right when you see that first glimmer of light poke through during dawn or get snuffed out during dusk. Golden hour occurs from 5:54 AM to 6:28 AM and from 7:25 PM to 7:59 PM. What is Twilight By definition, twilight is that period before the light has completely broken or disappeared over the horizon. When sunrise is at 5:54 AM: blue hour occurs from 4:17 AM to 5:54 AM. For instance in Egypt (every 21st of June), when sunset is at 7:59 PM: blue hour occurs from 7:59 PM to 9:35 PM. Time of year, location, and air quality all have an impact on the exact timing of blue hour. During the blue "hour", red light passes through space while blue light is scattered in the atmosphere, and thus reaches Earth's surface.īlue hour usually lasts about 20–96 minutes right after sunset and right before sunrise. This effect is caused by the relative diffusibility of shorter wavelengths (bluer rays) of visible light versus the longer wavelengths (redder rays). When the sky is clear, the blue hour can be a colourful spectacle, with the indirect sunlight tinting the sky yellow, orange, red, and blue. In fact, the blue hour occurs when the Sun is far enough below the horizon so that the sunlight's blue wavelengths dominate due to the Chappuis absorption caused by ozone. The still commonly presented incorrect explanation claims that Earth's post-sunset and pre-sunrise atmosphere solely receives and disperses the sun's shorter blue wavelengths and scatters the longer, reddish wavelengths to explain why the hue of this hour is so blue. Rather, blue hour refers to the state of natural lighting that usually occurs around the nautical stage of the twilight period (at dawn or dusk). Since the term is colloquial, it lacks an official definition such as dawn, dusk, or the three stages of twilight. The blue hour occurs when the Sun is far enough below the horizon so that the sunlight's blue wavelengths dominate due to the Chappuis absorption caused by ozone. This shade differs from the colour of the sky on a clear day, which is caused by Rayleigh scattering. below the horizon in the evening and ends when the geometric center of. Evening nautical twilight (nautical dusk) begins when the geometric center of the sun is 6 deg. During this time, the remaining sunlight takes on a mostly blue shade. By definition the twilight means the soft glowing light from the sky when the sun is below the horizon, caused by the reflection of the sun’s rays from the atmosphere. The blue hour (from French l'heure bleue pronounced ) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon. The term had flexibility, just as the English word twilight. The Pro 7:8-10 and Job 7:4 passages above show examples of evening and morning twilight () respectively. ![]() Period of twilight in the morning or evening Blue hour at the Old Cathedral of the Holy Name of Jesus, Bragança in Portugal Twilight () was used in either evening or morning relation. ![]()
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