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A sundial on a gravestone in Kilbirnie Auld Kirk, Kilbirnie, Ayrshire, Scotland. The motto at top reads, The motto at top reads, "Life is but a passing shadow, the shadow of a bird on the wing."
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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.
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Print/export Download as PDF; Printable version; In other projects ... Pages in category "Word puzzles" The following 21 pages are in this category, out of 21 total.
Before the invention of the clock the sundial was the only way to measure time. After the invention of the clock, the sundial maintained its importance, as clocks needed to be reset regularly from a sundial, because the accuracy of early clocks was poor. A clock and a sundial were used together to measure longitude. Dials were laid out using ...
The gnomon is the triangular blade in this sundial. A gnomon (/ ˈ n oʊ ˌ m ɒ n,-m ə n /; from Ancient Greek γνώμων (gnṓmōn) 'one that knows or examines') [1] [2] is the part of a sundial that casts a shadow. The term is used for a variety of purposes in mathematics and other fields, typically to measure directions, position, or time.
Therefore, the analemmatic sundial is an ellipse, where the short axis is aligned north–south and the long axis is aligned east–west. The noon hour line points true North, whereas the hour lines for 6am and 6pm point due West and East, respectively; the ratio of the short to long axes equals the sine sin(Φ) of the local geographical ...
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