Sundials - World's Oldest Clocks

North American Sundial Society

Sundials of North America

This is a complete listing of sundials in the North American Sundial Society Registry. Click on any dial thumbnail picture or city name to display the full dial listing and images. To see sundials from a particular state or province, you may click on the list at right to see all registered sundials in that state, province or country (at bottom) displayed in city order.

You may also type into the NASS search field at upper right any search word such as "equatorial" to get a list of all articles mentioning equatorial dials and a list of all equatorial sundials in the registry. (Try other dial types: "vertical", "horizontal", etc).

St. Louis Missouri USA Vertical Dial Dial 983
The Mullanphy School is the last school of 48 designed by and constructed under the guidance of William B. Ittner (1864-1936), an architect and Commissioner of School Buildings for St. Louis, MO. Only hour lines are marked on this simple vertical sundial. The picture of the sundial was taken at 1:41 PM CDT on 7 May 2019. Using the relation T(solar) = T(civil) + EOT - Daylight - LonCorrection, with EOT=3.3m, Daylight=1h, and LonCorrection=1m, indicates that the dial should show 12:43:31. This suggests that Ittner’s sundial at the Mullanphy School displays this sundial time to a reasonable approximation, especially considering that its only time markings are hour lines.
Logan Ohio USA Analemmatic Dial Dial 982
An analemmatic dial set in a gravel rectangle. It has a concrete walkway and circular hour markers in two ellipses for standard and daylight time. The hour numbers are adjusted for longitude, shifting them by 30 minutes (such that the due north line reads 12:30).
Magdalena New Mexico USA Obelisk or Vertical Gnomon Dial 981
This vertical gnomon sundial sitting on a 46-by-35-foot concrete slab was constructed using concrete piers of a solar mapping radio telescope array that Robert Bracewell originally built near the Stanford University campus. The array was abandon in the 1980's. The 10 piers were moved to the VLA in 2013 and arranged as a vertical gnomonic dial. NASA: "As for most sundials the shadow cast by the central gnomon follows markers that show the solar time of day, along with solstices and equinoxes. But markers on the [Bracewell] radio sundial are also laid out according to local sidereal time. They show the position of the invisible radio shadows of three bright radio sources in Earth's sky, supernova remnant Cassiopeia A, active galaxy Cygnus A, and active galaxy Centaurus A."
Saskatoon Saskatchewan Canada Vertical Dial Dial 980
It is a replacement for a south-facing vertical dial that was in the same location until the 1990s. It is approximately 4-foot wide by 12 -foot long. The gnomon is a metal rod held by four struts. The dial tells local solar time, showing Roman hours from 6am to 6pm. There is an elaborate Equation of Time graph and instructions for use at the bottom of the dial. At the top is latitude, longitude and elevation.
Joplin Missouri USA Vertical Dial Dial 979
This is a simple but nicely engraved vertical sundial about 2-foot square made of concrete. The hour lines are delineated every half hour and marked on the hour in Arabic numbers. The gnomon is at least 1-inch thick, now epoxied into place. The hour lines converge correctly to the morning and afternoon toe of the gnomon, but no split noon hour line is seen. The dial is slightly recessed into the brick wall on the eastern edge correcting the Joplin street lay out of 1873 that used magnetic north that was 10 degrees east of north.
Stafford Virginia USA Vertical Dial Dial 978
This vertical dial is 12 feet tall and nearly 20 feet wide. It is made of quarter-inch aluminum. The white hour lines running from 10am to 5pm are 4-inches wide. They run from the summer to winter solstice. The blue solstices and equinox line are quarter-inch aluminum 5-inches wide. The gnomon base is a yellow sun 10-inches in diameter with a 2-inch diameter gnomon. The nodus on the gnomon is a sphere 6-inches in diameter.
Richmond Virginia USA Horizontal Dial Dial 977
A bronze dial 11.5 inches in diameter, 21 inches high. It is signed by Thomas Hart and dated 1765. The inscription on the dial implies a much later date of late 1800's or early 1900's.
Des Moines Iowa USA Horizontal Dial Dial 976
This is an ornate 12-inch diameter bronze horizontal dial with a central sun underneath the gnomon. Surrounding the the sun is an 8-point compass rose. On the chapter ring the hours are embossed from 5am to 7pm in Roman numerals that face outward. Time is delineated every 10 minutes. The gnomon is simple but too long for the dial, extending 2 inches past the dial edge. The place where a motto might be placed is empty, awaiting a bronze insert.
Des Moines Iowa USA Horizontal Dial Dial 975
This is a 32-inch diameter horizontal dial made of stainless steel. Hour lines are engraved for every half hour and extend from summer to winter solstice based on the tip of the triangular gnomon. Hours are marked in Arabic numerals. Between the solstice limits are declination lines for the first of each month. Note that the inscribed latitude and longitude are slightly in error.
Rock Island Illinois USA Analemmatic Dial Dial 974
This analemmatic dial is 20-foot wide within a 30-foot circle, all made of colored concrete. The Arabic dial hour markers follow an ellipse from 6 am to 6 pm. The dial is decorated with a botanical and Rotary Club theme. Gears and the Rotary 4-way test are interspersed with flowers and leaves of the four seasons.
Davenport Iowa USA Horizontal Dial Dial 973
This is a 40-foot diameter sundial made only from flowers. Hours are shown from 6am to 6pm. The gnomon is made of steel and wire mesh with sweet autumn clematis growing on it. The clematis vines are kept trimmed and tied up to keep the shadow from getting too big. The gardner commented, "If I were doing it over I would use a metal piece for the shadow finger." There is a steel frame in the ground to mark the outer edge and all the divisions of where to plant the plants inside the bed. The plants in the inner area of the sundial change from year to year – in 2019 it was two colors of marigolds. Alternanthera or Joseph’s Coat are used on the outer edge by the numbers. These flowers are sheared to keep them low and compact. The numbers are planted with green Alternanthera and surrounded by a band of red Alternanthera. These flower numbers are sheared with small electric grass shears and kept about 2 inches above the red band. Other plants in the sundial garden include large “elephant ears,” cactus-like agave, alyssum, ageratum and lime green and purple nicotiana. The purple nicotiana becomes fragrant after dark, providing an olfactory as well as a visual delight for visitors watching the lights play on the fountain.
Denver Colorado USA Equatorial Dial Dial 972
Bronze equatorial dial marking hours with Arabic numerals from 4:00 am to 8:30 pm for summer and from 5:00 am to 7 pm in winter. Additional marks indicate time in 15 minute and 5 minute intervals. Noon gap to choose gnomon shadow side. Hour lines marked from leading edge of shadow. The dial may be rotated by a hand wheel at bottom of the dial to adjust for both the equation of time and daylight savings time.
Roselawn Indiana USA Horizontal Dial Dial 971
This dial consists of a fiberglass 18-foot high 36-foot gnomon in the shape of a bare tan-colored human leg. Hence the dial's name of "The Leg". The tip of the toe acts as a nodus. There are no hour lines and no declination lines. Instead, during summer months a series of hour markers are arranged on ground beneath the path of the nodus shadow.
Iowa City Iowa USA Equatorial Dial Dial 970
An 2-foot diameter dial with a wide 8-inch equatorial band. Vertical lines mark half hours from 5 am to 7pm in Arabic numerals placed at both the top and bottom of the band. Zodiac declination with month and dates engraved. The shadow nodus is held in place by a horizontal rod. Time and date marks are faint, implying that the dial has been continually polished over the years.
Summerland British Columbia Canada Equatorial Dial Dial 969
This is a standard equatorial in reasonable condition, mass produced, probably steel, about 2 feet in diameter. As at 2019, it is loose on its base and so visitors are likely to find it out of alignment. It is mounted on a rough stone pedestal decorated with strips of metal reminiscent of plant foliage reaching up around it.
Sterling Colorado USA Horizontal Dial Dial 968
This horizontal dial is 18 inches in diameter made of painted iron. Parts of the dial face have rusted. The dial is marked hourly from 6am to 6pm to 6pm using Roman numerals at the dial circumference. Hour lines are made using a series of dots. The swept-wing design of gnomon has an angle of 42.5 deg, about 2 degrees higher than the latitude. The dial sits on a limestone bolder.
Denver Colorado USA Vertical Dial Dial 967
This monumental size vertical dial consumes much of the south side of the Newman Center for the Performing Arts. The dial face is limestone and sandstone with disks standing out from the wall to mark the hours from 7am until 5pm. Two row of brass disks show the time: one circular set close to the gnomon for winter and another set at the circumference for summer. The size of the disks vary, growing in size from 7am to noon, then repeating the growing size from 1pm until 5pm. Roman numerals at 7, 12, and 5 show the hours.
Nelson British Columbia Canada Horizontal Dial Dial 966
The elegant bronze gnomon is 6 foot high with a modern interpretation of the zodiac sculptured into the lower half. The zodiac is represented by reliefs of Leo, Taurus, Pisces, Gemini, Virgo, and Sagittarius with his bow. The dial face is integrated into the plaza with a stainless steel chapter ring about 12 feet in diameter. The chapter ring has ornate grill work and Roman numerals to mark the hours. A small disk shows the Equation of Time correction in polar form with the months labelled along the circumference and EOT shown radially. The resulting graph looks somewhat like a kidney.
Denver Colorado USA Horizontal Dial Dial 965
This monumental dial has a 58 foot tall gnomon made of aluminum cladding on a steel frame sitting on a concrete base. The surrounding elliptical walkway has red sandstone lines marking the time from 6 am to 6 pm. Time may be slightly off as the time lines do not account for the change in height between the walkway and the dial base. The markers south of the 6 o'clock lines are added only to provide artistic balance and do not mark time.
Denver Colorado USA Horizontal Dial Dial 964
A 12 inch bronze horizontal dial marking quarter hours with Roman numerals.from 5 AM to 7 PM. The gnomon is about 1 1/2 inches wide and the hour lines are appropriately split at the noon marker. The dial sits on 3-foot stone plinth.

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