Blue hour in the context of "Skagen Painters"

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⭐ Core Definition: Blue hour

The blue hour (from French l'heure bleue; pronounced [lœʁ blø]) 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. During this time, the remaining sunlight takes on a mostly blue shade. This shade differs from the colour of the sky on a clear day, which is caused by Rayleigh scattering.

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 in the ozone layer. Since the term is colloquial, it lacks an official definition such as dawn, dusk, or the three stages of twilight. 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).

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👉 Blue hour in the context of Skagen Painters

The Skagen Painters (Danish: Skagensmalerne) were a group of Scandinavian artists who gathered in the village of Skagen, the northernmost part of Denmark, from the late 1870s until the turn of the century. Skagen was a summer destination whose scenic nature, local milieu and social community attracted northern artists to paint en plein air, emulating the French Impressionists—though members of the Skagen colony were also influenced by Realist movements such as the Barbizon school. They broke away from the rather rigid traditions of the Royal Danish Academy of Fine Arts and the Royal Swedish Academy of Arts, espousing the latest trends that they had learned in Paris. Among the group were Anna and Michael Ancher, Peder Severin Krøyer, Holger Drachmann, Karl Madsen, Laurits Tuxen, Marie Krøyer, Carl Locher, Viggo Johansen and Thorvald Niss from Denmark, Oscar Björck and Johan Krouthén from Sweden, and Christian Krohg and Eilif Peterssen from Norway. The group gathered together regularly at the Brøndums Hotel.

Skagen, in the very north of Jutland, was the largest fishing community in Denmark, with more than half of its population so engaged. Among the locals, fishermen were by far the most common subject for the Skagen painters. Skagen's long beaches were exploited in the group's landscapes; P.S. Krøyer, one of the best known of the Skagen painters, was inspired by the light of the evening "blue hour", which made the water and sky seem to optically merge. This is captured in one of his most famous paintings, Summer Evening at Skagen Beach – The Artist and his Wife (1899). Although the painters had their own individual styles without any requirement to adhere to a common approach or manifest, one of their common interests was to paint scenes of their own social gatherings, playing cards, celebrating or simply eating together.

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Blue hour in the context of Long-exposure photography

Long-exposure, time-exposure, or slow-shutter photography involves using a long-duration shutter speed to sharply capture the stationary elements of images while blurring, smearing, or obscuring the moving elements. Long-exposure photography captures one element that conventional photography does not: an extended period of time.

The paths of bright moving objects become clearly visible—clouds form broad bands, vehicle lights draw bright streaks, stars leave trails in the sky, and water waves appear smooth. Only bright objects leave visible trails, whereas dark objects usually disappear. Boats in long exposures disappear during the daytime, but draw bright trails from their lights at night.

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Blue hour in the context of Twilight

Twilight is daylight illumination produced by diffuse sky radiation when the Sun is below the horizon as sunlight from the upper atmosphere is scattered in a way that illuminates both the Earth's lower atmosphere and also the Earth's surface. Twilight also may be any period when this illumination occurs, including dawn and dusk.

The lower the Sun is beneath the horizon, the dimmer the sky (other factors such as atmospheric conditions being equal). When the Sun reaches 18° below the horizon, the illumination emanating from the sky is nearly zero, and evening twilight becomes nighttime. When the Sun approaches re-emergence, reaching 18° below the horizon, nighttime becomes morning twilight. Owing to its distinctive quality, primarily the absence of shadows and the appearance of objects silhouetted against the lit sky, twilight has long been popular with photographers and painters, who often refer to it as the blue hour, after the French expression l'heure bleue.

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Blue hour in the context of Chappuis absorption

Chappuis absorption (French: [ʃapɥi]) refers to the absorption of electromagnetic radiation by ozone, which is especially noticeable in the ozone layer, which absorbs a small part of sunlight in the visible portion of the electromagnetic spectrum. The Chappuis absorption bands occur at wavelengths between 400 and 650 nm. Within this range are two absorption maxima of similar height at 575 and 603 nm.

Compared to the absorption of ultraviolet light by the ozone layer, known as the Hartley and Huggins absorptions, Chappuis absorption is distinctly weaker. Along with Rayleigh scattering, it contributes to the blue color of the sky, and is noticeable when the light has to travel a long path through the Earth's atmosphere. For this reason, Chappuis absorption only has a significant effect on the color of the sky at dawn and dusk, during the so-called blue hour. It is named after the French chemist James Chappuis (1854–1934), who discovered this effect.

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Blue hour in the context of Cheena vala

Chinese fishing nets (Cheena vala in India or tangkul in Indonesia) are a type of stationary lift net in India and Indonesia. They are fishing nets that are fixed land installations for fishing. While commonly known as "Chinese fishing nets" in India, the more formal name for such nets is "shore operated lift nets". Huge mechanical contrivances hold out horizontal nets of 20 m or more across. Each structure is at least 10 m high and comprises a cantilever with an outstretched net suspended over the sea and large stones suspended from ropes as counterweights at the other end. Each installation is operated by a team of up to six fishermen. While such nets are used throughout coastal southern China and Indochina, in India they are mostly found in the Indian cities of Kochi and Kollam, where they have become a tourist attraction. This way of fishing is unusual in India and almost unique to the area, as it was introduced by Chinese explorers who landed there in the 14th century. Indeed, one interpretation of the city name Kochi is ‘co-chin', meaning ‘like China.’

The system is sufficiently balanced that the weight of a man walking along the main beam is sufficient to cause the net to descend into the sea. The net is left for a short time, possibly just a few minutes, before it is raised by pulling on ropes. The catch is usually modest: a few fish and crustaceans, which may be sold to passers-by within minutes.

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