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sundial    音标拼音: [s'ʌnd,ɑɪl]

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  • Sundial - Wikipedia
    The term sundial can refer to any device that uses the Sun's altitude or azimuth (or both) to show the time Sundials are valued as decorative objects, metaphors, and objects of intrigue and mathematical study
  • 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
  • Sundial Bridge — Turtle Bay
    As the name suggests, the Sundial Bridge is, in fact, a working sundial and is one of the largest in the world The sundial shadow traces such a large arc that it can record only four hours a day, from 11am - 3pm
  • How a Sundial Works (And Why You Need One in Your Backyard)
    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
  • How does a sundial work? - EAAE
    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
  • 11 Types of Sundials to Enjoy Tracking Time the Old Way
    Among the oldest scientific devices known to humankind, the different types of sundials have been around since 1500 BCE, built by some very smart members of the Egyptian community The first sundial was as basic as it gets—shaped like an ‘L’ with vertical and horizontal legs to cast shadows
  • 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
  • Sundial S
    They handed out over 1400 of the sundial cut-outs, with the classic horizontal sundial and Briggs polar dial being the most popular Especially important were the numerous contacts made with teachers who will now enhance their science classes with sundials
  • Sundial Bridge - Explore Shasta County
    Finished in 2004, the Sundial Bridge is an architectural wonder that doubles as a working sundial (one day per year) — one of the biggest of its type worldwide Rising 217-foot-tall and leaning somewhat northward, its most striking aspect spans 710 feet across the Sacramento River
  • How do sundials work? - Yale Scientific Magazine
    When the earth rotates about its axis, the sun appears to “move” across the sky, causing objects to cast shadows A sundial contains a gnomon, or a thin rod, that casts a shadow onto a platform etched with different times





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