Sundials - World's Oldest Clocks

North American Sundial Society

Selected Sundials of Arizona

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Superior Arizona USA Horizontal Dial 105
A small 8 in. bronze horizontal dial with raised Arabic numerals marking the hours. The dial is set on a massive cobble stone and mortar base suitable for sitting upon while watching the hours.
Surprise Arizona USA Horizontal Dial 574
A 108-inch diameter granite dial face with a 92-inch steel gnomon and nodus. Dial furniture includes a solar noon mark, sunrise and sunset points on the solstices and equinoxes, ecliptic date lines and an EOT graph.
Tempe Arizona USA Horizontal Dial 9
A 17 inch diameter bronze horizontal dial, mounted in a metal collar that slopes 5 deg S to correct for Tempe latitude of 33 N. The dial face has radiating hour, half-hour and 15-minute lines, encircled by the inscription "Grow old along with me. The best is yet to be." On the outside of the inscription are Roman numerals from VI to VI. Filling out the outer circle is inscribed "Tempe Garden Club". The dial sits on top of a square pedestal approximately 2 feet high
Tempe Arizona USA Horizontal Dial 23
A horizontal dial from Picture Rock Sandstone with 24k gold-plated inlaid brass fittings, 25 inches wide by 36 inches long, with gnomon 12.5 inches high. Gnomon is 1.5 inches thick. Total sundial weight 110 lbs. Time is marked in 10 minute intervals. Has Equation of Time and moonlight reading time correction table. Has the time and direction of sunrises and sunsets, the solstices, equinoxes, solar azimuth, and high noon.
Tempe Arizona USA Equatorial Dial 75
An equatorial dial designed by R. Newton Mayall with a "curved triangular gnomon over a curved face approximately 1ft. wide. Tells the day of the year and standard time noon." Has a plaque explaining the Equation of Time.
Tucson Arizona USA Equatorial Dial 4
A bronze equatorial dial approximately 2 ft. in diameter designed by R. Newton Mayall. Mayall stated, "When I was asked to design the sundial in front of the Museum at Kitt Peak I was more than pleased, for it gave me a chance to work a semblance of astronomy into it. The design reflects the great telescope nearby, with its base and fork type mounting, the dial itself being the "telescope"." The dial surface is a half-cylinder whose inner surface has seven date lines and 15 minute apparent solar timelines. A thin rod supports a 1/4 inch spherical nodus in the middle of the sundial directly above the point where the 12 noon line crosses the equinox line. The shadow of the nodus tells both the apparent solar time and the date. The dial is in fair condition, with the brass gnomon rod and nodus sagging, giving rise to a noticeable error in time and date readings. There is a separate plaque in front of the dial that gives instructions for obtaining standard time using a table of the Equation of Time corrected for the dial longitude.
Tucson Arizona USA Sun Circle Dial 11
A "Stonehenge" or sun circle dial designed by Chris Tanz, Susan Holman, Paul Edwards and with the help of Will Grundy and sponsored by the Pima County Flood Control and Transportation Dept. The structure uses a broken circle of walls to create designs made of light based on the movement of the sun. The circle, 50 feet in diameter with 8 foot walls is modeled loosely on the Casa Rinconada kiva ruins in Chaco Canyon, N.M. The walls are of integrally colored concrete block, concrete, and flagstone. Lines on a bronze plaque indicate north and south and the direction of sunrise and sunset on the equinoxes and solstices. Holes in the wall do the same. Solar noon is marked when sunlight comes through a slot in the South wall and passes a line on the floor.
Tucson Arizona USA Horizontal Dial 12
This concrete and adobe brick horizontal dial is approximately 8 1/2 feet in diameter with a triangular gnomon 25 x 32 inches. This is a large, but very plain sundial except for the shiny chrome plated gnomon. It lacks numerals, but has hour points and shows the cardinal points. The dial is corrected for longitude. The pedestal is missing some bricks and is adorned with graffiti.
Tucson Arizona USA Horizontal Dial 14
A 25 inch circular engraved horizontal dial in a large irregular stone. Surrounding the dial on the stone are zodiacal signs and a beautiful engraved drawing of the surrounding mountains. The designer, John Carmichael, calls these dials "horizontal string heliochronometers" since the gnomon is a brass cable held very straight under tension from a heavy counterweight which is suspended from a brass hinged lever.
Tucson Arizona USA Vertical Dial 533
A declining vertical stained glass "Gecko" sundial 58 x 20 inches consisting of 153 colored glass pieces and exterior rod gnomon with triangular base. Paintings on 11 glass pieces use vitreous kiln-fired enamels and stains. Dial and four adjacent panels consisting of 540 glass pieces are set in bay window overlooking succulent garden containing additional sundials. Dial glass panel includes painting of a Tucson Banded Gecko stalking fly, a star field, sun face and solar noon mark. Dial declines 27.4? east of south. Contact owner John Carmichael to arrange viewing.
Tucson Arizona USA Vertical Dial 544
Four vertical dials on the faces of a 100-inch tall redwood cupola on the roof of a private residence. The 21-inch dial faces are kiln-fired porcelain on steel; the bezels and gnomons are copper. The dials are longitude corrected for MST. Three dials have solar noon marks.
Tucson Arizona USA Vertical Dial 566
A vertical 44x92 inch dial declining 4.53? east of south painted on the rough textured stucco wall of a private home. The 2x4 inch tall conical horizontal gnomon is gold plated brass. The dial face is hand painted with elastomeric acrylic exterior house paint. The horizontal conical gnomon optimizes the nodus shadow at the location low latitude to show time and date. Dial face shows date/declination lines, solar noon mark and hour, 1/2-hour and 15 minute lines. To arrange viewing, contact owner Christina McVie.
Tucson Arizona USA Analemmatic Dial 825
This nearly 14-foot wide analemmatic human sundial replaces the previous sundial at the same location. The previous dial by an unknown designer had several design errors and was in poor condition. The Flandrau Planetarium replace it, choosing a sundial with a blue background and white hour numerals. Dial Markings include quarter hour marks, Solar Noon Mark, Date Line with one week marks, Alignment Marker for Sunrise and Sunset (Bailey Points) with Solstice and Equinox lines, and the four Cardinal Points of the compass. The dial has a built-in longitude correction and shows Mountain Standard Time when readings are adjusted for The Equation of Time
Tucson Arizona USA Vertical Dial 579
Located on a side street wall of a private home, this 4x6 foot due south vertical dial uses welded iron numerals and gnomon. Built in 1954, this is the oldest known sundial in Tucson. Designed using Mayall and Mayall's "Sundials" and described in detail in April, 1954 Home and Garden Magazine.
Tucson Arizona USA Vertical Dial 711
An 84x47 inch vertical dial declining 18? east of south on the outside wall of a private residence. Roman hour numerals are on 8 inch square hand-painted ceramic tiles. The gnomon and support are welded wrought iron painted black. A hand painted EOT graph is shown on a matching ceramic tile. This is a historic home designed by southwestern architect Josias Joesler. Homeowner found original architectural drawings showing a gnomonically-flawed sundial that was never installed and contacted John Carmichael to design this accurate new dial.
Tucson Arizona USA Vertical Dial 456
This is a 10 x 10 foot south vertical wall dial with hour lines painted on the wall that are corrected for longitude. A unique feature of this dial is the time scale can be rotated forward or back slightly to compensate for the Equation of Time. However, because only the hours are marked, precise minute reading is difficult. Welded steel was used to make the time marker ring and gnomon.
Tucson Arizona USA Horizontal Dial 464
A horizontal sundial 45 x 61 inches with a monofilar brass cable gnomon and tension counterweight. This is the largest horizontal sundial in the US carved on a single piece of stone, taking two years to build. The dial has hour lines from 5am to 8pm, corrected for longitude. Each hour line has an analemma and in the lower right of the dial is a graph of the Equation of Time. A nodus on the wire gnomon indicates date, with declension lines for summer and winter solstice, equinox, and date lines. Time and direction of sunrise and sunset are marked on the equinox and solstice lines. At the base of the gnomon is a 16-point compass rose. On the left side of the dial is a table for telling time by moon shadows. In the center is a copy of the hands from "The Creation" by Michelangelo.
Tucson Arizona USA Horizontal Dial 465
A simple square horizontal dial 20 x 20 inches carved in a 3 inch block of granite with a bronze gnomon. The dial has hour lines from 6am to 6pm for local solar time. No graph or table for longitude and Equation of Time corrections. Dial sits atop a 3 foot square pedestal.
Tucson Arizona USA Projection Dial 735
A fused silica glass spherical lens projects a solar image spot onto the inner surface of a spherical segment of glass with a frosted area inscribed with hour lines and Arabic hour numerals. Time is read from the bright spot of light on the frosted surface while standing under the dial. Dial is mounted atop a pipe pillar on the patio of the Visitor Center.
Vail Arizona USA Analemmatic Dial 599
A brass and concrete analemmatic dial set in the Butterfly Garden at Colossal Cave Mountain Park at 3415 feet elevation. The dial is 21 feet E-W across the hour markers. A hand-held rod gnomon 143 inches long includes a bubble level for positioning. There is a modest park use fee to view this dial.