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  2. Silver nitrate - Wikipedia

    en.wikipedia.org/wiki/Silver_nitrate

    Silver nitrate is an inorganic compound with chemical formula AgNO 3. It is a versatile precursor to many other silver compounds, such as those used in photography. It is far less sensitive to light than the halides. [citation needed] It was once called lunar caustic because silver was called luna by ancient alchemists who associated silver ...

  3. Alchemical symbol - Wikipedia

    en.wikipedia.org/wiki/Alchemical_symbol

    The tradition remains today with the name of the element mercury, where chemists decided the planetary name was preferable to common names like "quicksilver", and in a few archaic terms such as lunar caustic (silver nitrate) and saturnism (lead poisoning). [4] [5] Lead, corresponding with Saturn ♄ Tin, corresponding with Jupiter ♃ ()

  4. Silver compounds - Wikipedia

    en.wikipedia.org/wiki/Silver_compounds

    Some silver oxide powder.. Silver is a relatively unreactive metal, although it can form several compounds. The common oxidation states of silver are (in order of commonness): +1 (the most stable state; for example, silver nitrate, AgNO 3); +2 (highly oxidising; for example, silver(II) fluoride, AgF 2); and even very rarely +3 (extreme oxidising; for example, potassium tetrafluoroargentate(III ...

  5. Caustic (optics) - Wikipedia

    en.wikipedia.org/wiki/Caustic_(optics)

    Caustics produced by a glass of water, visible as patches of light Cardioid caustic at the bottom of a teacup Caustics made by the surface of water Caustics in shallow water In optics , a caustic or caustic network [ 1 ] is the envelope of light rays which have been reflected or refracted by a curved surface or object, or the projection of that ...

  6. Caustic (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Caustic_(mathematics)

    Reflective caustic generated from a circle and parallel rays. On one side, each point is contained in three light rays; on the other side, each point is contained in one light ray. In differential geometry, a caustic is the envelope of rays either reflected or refracted by a manifold. It is related to the concept of caustics in geometric optics ...

  7. Lunar caustic - Wikipedia

    en.wikipedia.org/?title=Lunar_caustic&redirect=no

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  8. Silver - Wikipedia

    en.wikipedia.org/wiki/Silver

    Silver is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining. Silver is a naturally occurring element.

  9. Meton of Athens - Wikipedia

    en.wikipedia.org/wiki/Meton_of_Athens

    The world's oldest known astronomical calculator, the Antikythera Mechanism (2nd century BC), performs calculations based on both the Metonic and Callipic calendar cycles, with separate dials for each. [2] [3] The foundations of Meton's observatory in Athens are still visible just behind the podium of the Pnyx, the ancient parliament. Meton ...