Sundials - World's Oldest Clocks

North American Sundial Society

Selected Sundials of Pennsylvania

Click on any photo or city name to get more sundial details and more photos.

Philadelphia Pennsylvania USA Analemmatic Dial 158
Analemmatic dial with bronze standing figures.
Philadelphia Pennsylvania USA Horizontal Dial 160
A 1 foot diameter bronze horizontal dial. It was presented by National Association of Watch and Clock Collectors in 1991. However, the style angle is 52?.
Philadelphia Pennsylvania USA Horizontal Dial 229
Brass horizontal dial by Alexander Stirling Calder. Local Hour lines plus EoT monthly corrections and differences between 12 world cities. Pedestal Sculpture is white marble and depicts 4 seated young women as the 4 seasons holding the dial on their shoulders. Built in 1905. Tip of gnomon appears damaged. The dial base is carved marble depicting four seated young female figures representing the four seasons.
Philadelphia Pennsylvania USA Equatorial Dial 741
An equatorial projection dial with a 12 inch diameter stainless steel equatorial ring incised with Arabic hour numerals that project onto a grooved central support shaft of Cipollino and Carrara marble set on a bluestone foundation. A hole near the top of the central marble shaft emits flowing water that runs down the central groove and is recirculated in the warm months. The sundial/fountain marble shaft is 7 inches wide, 36 inches high with a 24 by 55 inch wide base. The dial and nearby Cipollino marble bench rest on a 13-1/2 foot diameter foundation of bluestone pavers set on concrete. Direct sunlight on the dial is limited by two of the three nearby buildings. In summer with a high elevation sun, sunlight casts gnomon shadows mid-day and for a few hours in the afternoon. The sundial/fountain sculpture was commissioned by Society Hill Towers in honor of I. M. Pei, Architect of the Towers and was dedicated on the 40th anniversary of the Towers in 2003.
Phoenix Arizona USA Vertical Dial 772
A dual-vertical cube dial with two 12 inch square dial plates declining 45? south of east and south of west. The east face shows hour lines for 6 AM to 12 PM; the west face shows hour lines for 12 PM to 6 PM. Roman numerals mark three hour lines on each face. The other two faces of the cube hold plaques with EOT corrections and information about its dedication for the Arizona Centenary in 2012. The dial faces and the EOT plaque are ceramic tile, diamond engraved and filled with black grout. The gnomons are thick-profile copper and made small to cast shadows on only the hour lines. The dial is about 5 feet high overall with a stucco-coated pedestal made of concrete blocks resting on a massive, reinforced concrete base
Phoenix Arizona USA Horizontal Dial 7
This large ground-level horizontal dial designed by Charles Keener. Dial is a circular concrete slab 62 in. diameter and 8 in. thick. The gnomon is 30 in. high, 41 in. substile, 55 in. stile. Dial has Roman numerals. Unfortunately, the 6AM and 8AM numerals are missing. Ground level dial composed of concrete slab 62 inch diameter and 8 inch thick.
Phoenix Arizona USA Horizontal Dial 578
A 10 foot diameter horizontal dial with steel gnomon. Live desert plants fill planters delineated by hour lines.
Pinawa Manitoba Canada Horizontal Dial 469
The Pinawa Heritage Sundial located in the center of town was constructed as a city wide effort to create pride and focus. The 17.5 foot high horizontal sundial has a gnomon constructed of steel and the 38.5 by 40.5 foot base is constructed of polished granite, rail, and granite stones. The sundial has two sets of time markers. An outer dial ring indicates local apparent time, while an inner dial ring indicates zonal solar time. Forming an integral part of the sundial, 12 icons were designed and constructed, illustrating the history of the region and its people.
Pine Mountain Georgia USA Analemmatic Dial 386
Interactive analemmatic dial set in an herb garden. Visit website
Pittsburgh Pennsylvania USA Horizontal Dial 107
A small horizontal metal dial perhaps 10 or 12 inches in diameter. The gnomon sits in the middle of the dial with an ornate cross-brace support. Surrounding the dial are two inscriptions. Gnomon is missing. The dial sits on a square stone supported by a square column of white stone.
Pittsburgh Pennsylvania USA Horizontal Dial 108
A circular horizontal dial about 18 inches in diameter. The dial has been removed altogether. Dial sits atop a circular column of ornately carved white stone with spiral flutes on the lower half.
Pittsburgh Pennsylvania USA Horizontal Dial 110
A horizontal dial of brass about 18 inches in diameter with a fluted edge. The gnomon is a simple design. The dial is supported by four balusters resting on a larger circular base. SUNDIAL HAS BEEN REMOVED FROM BASE
Pittsburgh Pennsylvania USA Horizontal Dial 641
A 12 inch octagonal carved sandstone horizontal dial with Roman hour numerals from 4 AM to 8 PM. The gnomon is missing. Dial face includes carved figures of a snake and a thistle and is marked latitude 40 35. The 1763 date ascribed to the dial's origin is coincident with the relief of the siege of Fort Pitt during Pontiac's Rebellion in that year. The 42nd and 77th Regiments of the Highland Guard and the 60th Regiment of the Royal Americans defeated the Native forces (Delaware, Shawnee, Mingo and Huron Tribes) at the Battle of Bushy Run in August, 1763, successfully quelling the Indian uprising in Southwestern Pennsylvania. The Highland Guard is artistically represented on the sundial by the thistle and the Royal Americans by the snake. Although the assignment of the 1763 date to the dial is not conclusive, the history of Fort Pitt, together with the design elements seen on the sundial and the location of its discovery, provides a plausible conclusion. This dial is reported to have been found at the site of the Fort Pitt Block House during its 1894 restoration by the Pittsburgh Chapter of the Daughters of the American Revolution who still own and preserve the structure and the sundial as a private museum. The Block House is the only surviving structure of Fort Pitt. Following the sundial's discovery in 1894, the dial was housed in the archives of the Carnegie Museum in Pittsburgh until 1916 when it was placed on a pedestal on the grounds of the Fort Pitt Block House for display. The dial was unfortunately exposed to acid rain then later covered with protective glass (later Plexiglas) that inadvertently accelerated its deterioration. Fortunately, an excellent picture taken between 1894 and 1900 shows the dial was in good condition when originally recovered. The dial was moved to a display case inside the Fort Pitt Block House in 2006. Today, the dial face is grainy and light gray. The reverse side is an irregular brownish gray that features an arrangement of holes that formerly served to mount the dial; four smaller holes marked by rust stains likely date to the 1980s when the dial was placed on a new, square granite pedestal. The dial face may be covered with a slip coating that was carved to produce the dial features. Measurement and analysis of the sundial hour line angles by Roger Bailey of NASS shows the dial was correctly designed for the latitude of Fort Pitt and even included a noon gap to correct for the thickness of the (now missing) gnomon.
Pittsburgh Pennsylvania USA Armillary Dial 436
Large metal armillary dial, about 6 feet in diameter. Has a double equatorial ring with Roman numerals for the hours held between the two rings. Also has horizontal and vertical rings. Dial has been removed.
Pittsford New York USA Vertical Dial 438
This old vertical north facing dial in on the Spring House, constructed circa 1822. The building was an old Erie Canal Inn. The dial is about 48 inches high by 30 inches wide, made of wood and painted with a white boarder. The gnomon is also white painted wood and "looks upside down" because the dial faces north. The dial and gnomon have been repainted several times.
Plymouth Massachusetts USA Horizontal Dial 342
approx. 8 feet in diameter Roman numerals, with half-hour marks and compass rose. Dial sits on a rectangular stone pedestal.
Pocatello Idaho USA Vertical Dial 742
A south-facing vertical dial split into two sculptures separated by a walking path. The dial faces are vertical powder coated steel sculptures with cut hour lines. The gnomons are travertine limestone blocks with the top edges pointing to celestial north. The edges of the gnomon stones cast the shadow onto the vertical dial faces. One dial face shows the morning hours, the other shows the afternoon hours. The gnomon styles extend to both sides of each dial face allowing extended time and season use. This sculpture, "PASSAGE OF TIME," was commissioned by the City of Pocatello to represent Pocatello as the "Gate City," historically known as the gateway to the Snake River Plains. The meandering sidewalk path represents passage through both time and space.
Pomfret Connecticut USA Pillar Dial 84
A 22 ft. high stone pillar dial built by William Ross Carpenter as a replica of the famous Charles Turnbull dial of Corpus Christi College in England dating from 1577. The pillar has multiple dials of various types. The Carpenter replica built in 1912 was restored in 1987. Ornate dial furniture with multiple inscriptions. A complex masterpiece. See the NASS Compendium Vol. 2 No. 1 for more details.
Port Arthur Texas USA Polar Equatorial Dial 446
A large Erickson Monument polar equatorial dial of light colored granite, approximately 6 feet in diameter and 6 inches thick. The gnomon shaft is steel, extending from the ground through the dial plate and outward another two feet. The base is a simple tier of raised concrete. 24 hours are inscribed on each side of the dial (summer and winter) as radiating lines with Arabic numbers at the end. Time is graduated by half-hour and 5 minute marks. Two equation of time graphs, each about 3 x 6 feet engraved in granite, are set at the north and south ends of the dial, providing corrections from Apr-Sep, and Oct-Mar. [An interesting note about the engraving for the Apr-Sep graph: The line originally said "For daylight savings time, subtract one hour", the word "subtract" was filled in and "you add" was inscribed over it.] In the top quadrant of the dial (both obverse and reverse) where the sun's shadow will never cast, are the names of cities in 16 different Time Zones. A beautiful and well-crafted sundial, it makes a fitting Seaman's Memorial. Compare this dial with other Erickson dials
Port Richmond, Staten Island New York USA Vertical Dial 142
17' H x 11' W x 8' D Painted steel with stainless steel wire cloth Noon mark and analemma features made of concrete and brass.