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  2. Sunspot drawing - Wikipedia

    en.wikipedia.org/wiki/Sunspot_drawing

    The first sunspot drawing, John of Worcester around 1128. Sunspot drawing or sunspot sketching is the act of drawing sunspots. Sunspots are darker spots on the Sun's photosphere. Their prediction is very important for radio communication because they are strongly associated with solar activity, which can seriously damage radio equipment. [1]

  3. Suns in alchemy - Wikipedia

    en.wikipedia.org/wiki/Suns_in_alchemy

    The black sun as pictured in the Putrifaction emblem of Philosophia Reformata (Johann Daniel Mylius) Sol niger (black sun) can refer to the first stage of the alchemical magnum opus, the nigredo (blackness). In a text ascribed to Marsilio Ficino three suns are described: black, white, and red, corresponding to the three most used alchemical ...

  4. File:Highest resolution photo of Sun (NSF) as of January 20 ...

    en.wikipedia.org/wiki/File:Highest_resolution...

    This is an image taken at infrared wavelengths, so it is not even visible with the naked eye, and "reality" would not be in black and white. (Would be closer to red colour.) Many great astronomy pictures are shown in false colours, since there is no easy representation of a narrowband wavelength. 02:25, 21 April 2022: 7,320 × 7,320 (17.87 MB)

  5. Newly-released photos capture the sun in highest resolution ...

    www.aol.com/newly-released-photos-capture-sun...

    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.

  6. Solar System - Wikipedia

    en.wikipedia.org/wiki/Solar_System

    The Sun in true white color. The Sun is the Solar System's star and by far its most massive component. Its large mass (332,900 Earth masses), [75] which comprises 99.86% of all the mass in the Solar System, [76] produces temperatures and densities in its core high enough to sustain nuclear fusion of hydrogen into helium. [77]

  7. Hand-colouring of photographs - Wikipedia

    en.wikipedia.org/wiki/Hand-colouring_of_photographs

    The solar camera, employing the focussed light of the sun, addressed the problem in a repurposing of the solar microscope [6] by American portrait artist David Acheson Woodward in 1857, [7] and others, before being superseded by enlargers employing artificial light sources from the 1880s. Life-size portraits made by this means were hand ...

  8. Trois crayons - Wikipedia

    en.wikipedia.org/wiki/Trois_crayons

    As drawing techniques evolved, artists combined red chalk with other chalks, including white chalk. The use of white chalk allowed artists to enhance lighting effects in their drawings. However, since white chalk was barely visible on white paper or parchment, artists began to use a toned background to allow the technique to work effectively.

  9. Sun printing - Wikipedia

    en.wikipedia.org/wiki/Sun_printing

    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.