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  2. Burt's solar compass - Wikipedia

    en.wikipedia.org/wiki/Burt's_solar_compass

    Burt's solar compass or astronomical compass/sun compass is a surveying instrument that makes use of the Sun's direction instead of magnetism. William Austin Burt invented his solar compass in 1835. The solar compass works on the principle that the direction to the Sun at a specified time can be calculated if the position of the observer on the ...

  3. Sunset (computing) - Wikipedia

    en.wikipedia.org/wiki/Sunset_(computing)

    After sunsetting is announced, usually very few changes are made to the hardware or software in question, as such work would be counterproductive, when its termination is soon to follow. In some cases, however, individual features of an application, server, or service may be phased out at different times, leading up to the eventual full shutdown.

  4. List of astronomical instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_astronomical...

    An astronomical instrument is a device for observing, measuring or recording astronomical data. They are used in the scientific field of astronomy , a natural science that studies celestial objects and the phenomena that occur in the cosmos, with the object of explaining their origin and evolution over time.

  5. History of sundials - Wikipedia

    en.wikipedia.org/wiki/History_of_sundials

    [11] [12] Sundials existed in China since ancient times, but very little is known of their history. It is known that the ancient Chinese developed a form of sundials c. 800 BCE, and the sundials eventually evolved to very sophisticated water clocks by 1000 CE, and sometime in the Song dynasty (1000–1400 CE), a compass would sometimes also be ...

  6. AP Physics - Wikipedia

    en.wikipedia.org/wiki/AP_Physics

    AP Physics C served as a calculus-based course for physical science and engineering students, whereas AP Physics B served as an algebra-based course for life science and pre-medical students. AP Physics A, which would have served as a concept-based course with little to no mathematics, was also planned, but it was never materialized, as ...

  7. Sunshine recorder - Wikipedia

    en.wikipedia.org/wiki/Sunshine_recorder

    The other instrument is a Marvin sunshine recorder. Older recorders required a human observer to interpret the results; recorded results might differ among observers. Modern sunshine recorders use electronics and computers for precise data that do not depend on a human interpreter. Newer recorders can also measure the global and diffuse radiation.

  8. History of engineering - Wikipedia

    en.wikipedia.org/wiki/History_of_engineering

    The ziggurats of Mesopotamia, the pyramids and Pharos of Alexandria in ancient Egypt, cities of the Indus Valley civilization, the Acropolis and Parthenon in ancient Greece, the aqueducts, Via Appia and Colosseum in the Roman Empire, Teotihuacán, the cities and pyramids of the Mayan, Inca and Aztec Empires, and the Great Wall of China, among many others, stand as a testament to the ingenuity ...

  9. Heliometer - Wikipedia

    en.wikipedia.org/wiki/Heliometer

    Heliometer at the Kuffner observatory (Vienna, Austria) Heliometer split lens, displayed at Custer Observatory, Long Island, New York.. A heliometer (from Greek ἥλιος hḗlios "sun" and measure) is an instrument originally designed for measuring the variation of the Sun's diameter at different seasons of the year, but applied now to the modern form of the instrument which is capable of ...