Sundial facts for kids
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 the time. There are a few commonly seen designs, such as the 'ordinary' or standard garden sundial. However, sundials can be designed for any surface where a fixed object casts a predictable shadow.
Ancient Egypt had sundials. Other cultures developed them further, including the Greeks and Romans.
Related pages
Images for kids
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SSW facing, vertical declining sundial on the Moot Hall in Aldeburgh, Suffolk, England. The gnomon is a rod that is very narrow, so it functions as the style. The Latin motto loosely translates as "I only count the sunny hours."
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Sundial in Singapore Botanic Gardens. The fact that Singapore is located almost at the equator is reflected in its design.
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World's oldest sundial, from Egypt's Valley of the Kings (c. 1500 BC)
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The Whitehurst & Son sundial made in 1812, with a circular scale showing the equation of time correction. This is now on display in the Derby Museum.
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Sunquest sundial, designed by Richard L. Schmoyer, at the Mount Cuba Observatory in Greenville, Delaware.
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Timepiece, St Katharine Docks, London (1973) an equinoctial dial by Wendy Taylor
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Horizontal sundial in Minnesota. June 17, 2007 at 12:21. 44°51′39.3″N, 93°36′58.4″W
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Crude sundial near Johnson Space Center
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"Double" sundials in Nové Město nad Metují, Czech Republic; the observer is facing almost due north.
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Polar sundial at Melbourne Planetarium
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Effect of declining on a sundial's hour-lines. A vertical dial, at a latitude of 51° N, designed to face due South (far left) shows all the hours from 6am to 6pm, and has converging hour-lines symmetrical about the noon hour-line. By contrast, a West-facing dial (far right) is polar, with parallel hour lines, and shows only hours after noon. At the intermediate orientations of South-Southwest, Southwest, and West-Southwest, the hour lines are asymmetrical about noon, with the morning hour-lines ever more widely spaced.
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Two sundials, a large and a small one, at Fatih Mosque, Istanbul dating back to the late 16th century. It is on the southwest facade with an azimuth angle of 52° N.
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Vertical reclining dial in the Southern Hemisphere, facing due north, with hyperbolic declination lines and hour lines. Ordinary vertical sundial at this latitude (between tropics) could not produce a declination line for the summer solstice. This particular sundial is located at the Valongo Observatory of the Federal University of Rio de Janeiro, Brazil.
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Ottoman-style sundial with folded gnomon and a compass. Debbane Palace museum, Lebanon.
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19th-century Tibetan Shepherd's Timestick
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Navicula de Venetiis on display at Musée d'histoire des sciences de la Ville de Genève.
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Declination lines at solstices and equinox for sundials, located at different latitudes
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Diptych sundial in the form of a lute, c. 1612. The gnomons-style is a string stretched between a horizontal and vertical face. This sundial also has a small nodus (a bead on the string) that tells time on the hyperbolic pelikinon, just above the date on the vertical face.
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Benoy Sun Clock showing 6:00 p.m.
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Stainless steel bifilar sundial in Italy
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See also
In Spanish: Reloj de sol para niños
