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The Book of the Long Sun (1993–1996) is a series of four science fantasy novels or one four-volume novel by the American author Gene Wolfe.It is set in the same universe as The Book of the New Sun series that Wolfe inaugurated in 1980, and the Internet Science Fiction Database catalogs them both as sub-series of the "Solar Cycle", along with other writings.
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The images, obtained in March 2023 by the ESA's Solar Orbiter, represent what the agency says are the highest-resolution views of the sun's surface, known as the photosphere, to date.
Most likely, the effect was first observed in scenery photographs including the sun. The sun, instead of being the whitest spot in the image, turned black or grey. For instance, Minor White's photograph of a winter scene, The Black Sun 1955, [1] was a result of the shutter of his camera freezing in the open position, producing severe overexposure.
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[3] [4] Photoperiodic flowering plants are classified as long-day plants or short-day plants even though night is the critical factor because of the initial misunderstanding about daylight being the controlling factor. Along with long-day plants and short-day plants, there are plants that fall into a "dual-day length category".
Sun printing may also refer to a photographic process using potassium dichromate which produces a negative plate for conventional lithographic printing. The process uses a film of gelatine spread on a flat and rigid surface. This is coated with a dilute solution of potassium dichromate and dried in low light conditions.
Sunflowers do not always point to the Sun. Flowering sunflowers face a fixed direction (often east) all day long, but do not necessarily face the Sun. [123] However, in an earlier developmental stage, before the appearance of flower heads, the immature buds do track the Sun (a phenomenon called heliotropism). Mature flowers face east. [124]