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sundial    音标拼音: [s'ʌnd,ɑɪl]

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  • 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)
    Building a sundial in your backyard may be an enjoyable and instructive hobby Here is a tutorial to assist you in creating your own makeshift sundial:
  • 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
  • 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
  • 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
  • Sundial S - NASS
    Volunteers from the Analemma Society and NASS demonstrated a number of sundial types and provided paper sundial cut-outs that were enjoyed by children, students, parents and teachers alike
  • How do Sundials Work? | Angi
    A sundial calculates sun time by allowing a stick, or gnomon, to cast a shadow on a dial plate with numbered lines Sundials are the earliest known timekeeping devices, dating back to Ancient Egypt
  • 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
  • Its about Time. . . to Make a Sundial! - Scientific American
    In this activity you will be making your own sundial and using your body to track the movement of the sun across the sky! For millennia people have used sundials to tell the time of day based





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