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sundial    音标拼音: [s'ʌnd,ɑɪl]

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  • Sundial (weapon) - Wikipedia
    Sundial was the codename of one of two massive nuclear bombs planned for testing by the University of California Radiation Laboratory, Livermore Branch as part of a classified [1][2] American weapons project in the early 1950s [3]
  • Sundial - Wikipedia
    A sundial is a horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the apparent position of the Sun in the sky In the narrowest sense of the word, it consists of a flat plate (the dial) and a gnomon, which casts a shadow onto the dial
  • Sundial | Definition, History, Types, Facts | Britannica
    Sundial, the earliest type of timekeeping device, which indicates the time of day by the position of the shadow of some object exposed to the sun’s rays As the day progresses, the sun moves across the sky, causing the shadow of the object to move and indicating the passage of time
  • How a Sundial Works (And Why You Need One in Your Backyard)
    What is a sundial? A sundial is a device used to tell time using the Sun and the movement of a specific shadow during the day How do sundials work? The Sun casts a shadow over a carefully calibrated rod, known as the gnomon The location of the shadow indicates the time of day, as designated by hour marks on the base of the sundial
  • 11 Types of Sundials to Enjoy Tracking Time the Old Way
    Here’s a breakdown of the different types of sundials, whether you’re interested in the science or the aesthetic value of owning some of the first types of clocks ever Let’s start with Equatorial sundials, sundials that earn their name from being parallel to the Earth’s equator as well as the equator of the celestial sphere
  • EAAE - How does a sundial work?
    A sundial is a device that measures time by the position of the Sun In common designs such as the horizontal sundial, the Sun casts a shadow from the gnomon, which is a thin rod straight edge, onto a flat surface marked with lines indicating the hours of the day
  • Sundials: Where Time Began - Farmers Almanac
    A sundial is one of the most common decorative ornaments seen in flower gardens today, providing quiet, aesthetic beauty as it peeks out from the rose bushes and hydrangeas It’s hard to imagine, but this simple device once served entire civilizations as the only means to tell time
  • Sundials on the Internet | Home
    The leading world Internet site on sundials, including sundial makers, books, journals, Sundial Trails all over the world, national societies, sundial projects, and many pictures of sundials
  • How do sundials work? - Yale Scientific Magazine
    A sundial contains a gnomon, or a thin rod, that casts a shadow onto a platform etched with different times As the sun changes relative positions over the course of a day, the rod’s shadows change as well, thus reflecting the change in time
  • Sundial - Simple English Wikipedia, the free encyclopedia
    A sundial A garden sundial at 9:30am A sundial shows the current solar time during the day It does this because the sun appears to move through the sky At different times in the day when the sun is shining, a shadow is cast in different places on the dial A person marks the dial with the time at a certain shadow This lets users easily see





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