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安裝中文字典英文字典辭典工具!
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- 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
- Sundial S - NASS
NASS and the Analemma Society will introduce students and families to a variety of sundials and offering hands-on activities to cut them out and test them using a solar heliograph It's all free Come and learn about Sundials – The World’s Oldest Clocks
- 11 Types of Sundials to Enjoy Tracking Time the Old Way
Sundials come in two main types—altitude and azimuth dials 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
- 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
- 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 - Yard Envy
Garden sundials are the perfect accent piece to any yard, garden, and landscape Highlight your garden with one of our brass, cast iron, bronze or armillary sundials
- How Does A Sundial Work? - Sciencing
Sundials can be divided into two basic types, altitude dials and directional dials An altitude dial allows for determination of time using the sun's distance above the horizon In all cases, these must be oriented to a compass direction, while in others the sun itself is a reference point
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