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).

Lansing Michigan USA Vertical Dial Dial 923
This is a vertical, east-declining sundial, 22 ft 6 in by 15 ft 10 in. The dial is constructed of 6061 aluminum alloy pieces electrostatically painted and bolted together,then mounted on a concrete block wall. The position of the gnomon, hour, solstice, and equinoctial lines are corrected for longitude to show time zone solar time. Stenciled hour line numbers are changed to display DST or EST at appropriate times of the year. Visitors can determine the correct time by referring to an Equation of Time display. During the year, the triangular gnomon tip casts its shadow on the declination lines of summer and winter solstices and equinoxes. This is the largest known vertical sundial in Michigan, and one of the largest in the United States.
Middletown Connecticut USA Vertical Dial Dial 922
This 6 x 6 ft. bronze, vertical sundial faces directly south on the curved sandstone wall of the Observatory. This dial was fabricated of Muntz metal bronze that received a hot applied green patina to compliment the brown sandstone color of this 1916 university observatory. Because of its large size, the metal dial weighs 650 lb. The hour numbers and lines are raised and applied to the surface of the dial. The Roman hour numbers that surround the dial plate in a frame take their shape according to the hour angle. Declination lines of the solstices and equinox are marked by the triangular gnomon shadow tip. The dial includes a built in longitude correction to show solar time for the time zone meridian. On a nearby wall below the dial, a plaque features an analemmatic graph for the equation of time correction to get clock civil time.
Albuquerque New Mexico USA Vertical Dial Dial 921
This painted vertical dial is 10 x 11 feet, covering a vast expanse of south facing wall. The dial has a strong New Mexico theme using bright colors, and many personal elements. There is a road runner, hot air balloon, a lunar footprint (centered at 2:18 (clock time) on July 20th 1969, the minute they landed). There is a red, white & blue star at the 11th hour of the 11th day of the 11th month for Veterans Day. In the night exposure of the sundial the star Polaris is just above the gnomon, as it should always be. All the little embedded details in the sundial are explained on the ‘Details’ tab of the website link below.
Vancouver British Columbia Canada Horizontal Dial Dial 920
This is a 25 cm horizontal dial engraved on a 1/4 inch yellow metal plate (probably bronze). It shows local solar time. The hour marks look precise and consistent, but upon closer look are oddly arranged. The dialist attempted to shift the dial hour lines to correct for longitude (3.17 deg west). The AM hour lines are fairly accurate except the earliest hour lines (IV, V) which inconsistently meet the gnomon foot on the wrong side. The PM hour lines seem to mirror the AM lines except that 3 degrees had been added to each, rendering inaccurate time throughout the afternoon. The gnomon is slightly bent, and nearby buildings and trees block the dial at some times of day. The dial is decorated using simple geometric and visually pleasing patterns. Shallow engraving is used for the hour lines (making them a bit difficult to read), labels, and decoration. The gnomon has a bird engraved on each side and sits on a wedge base. The dial sits on a short granite pedestal with a polished top surface, and was commissioned by his parents in memory of Robert Carlyle Howard (born 1953, died 1970).
Vancouver British Columbia Canada Hours to Sunset Dial 919
This bright and colorful vertical dial declines west, showing "Hours to Sunset" (Italian hours). The dial is held up by two posts on a board 60 x 90 cm (24 x 36 inches). The dial face is decorated in the colours of the rainbow, with a band of color for each hour left to sunset. Quarter hours are marked using thin white lines. The dial was commercially printed on aluminum-plastic laminated material, with a UV protective coating. The gnomon is a repurposed decorative gate hinge. The supporting structure is made from red cedar.
St. Louis Missouri USA Horizontal Dial Dial 918
The dial plate is a 16 x 16 inch square piece of milk glass, with the hour lines and Arabic numerals made by sandblasting through a photo-etched stencil and then spraying black with lithichrome paint into the etchings. The triangular gnomon is made of 3/8 inch thick stainless steel. Saint Louis sculptor Abraham Mohler made the pedestal from EW Gold limestone quarried near Ste. Genevieve, MO. It is 18 x 18 inches square and 40 inches tall.
Attleboro Massachusetts USA Vertical Dial Dial 917
A 45 x 45 inch slate sundial hangs over the bay window. The dial is a vertical decliner with hour lines from 4am to 1pm. The gnomon has been damaged, but if you look carefully, there is a nodus and on the dial face are faint declination lines showing summer & winter solstices and the equinox. The hours are delineated on the hour and marked in Arabic numbers.
Perryville Missouri USA Vertical Dial Dial 916
The sundial is attributed to Vincentian Brother Angelo Oliva, being painted sometime in the 14 year period between 1823, when he arrived in Perryville to lead the reconstruction of the original, wooden church into the present one made of stone, and 1837 when he died. The dial has been recently repainted.
Bellingham Washington USA Vertical Dial Dial 915
The vertical dial is incorporated into a bright, flowing mural 29 x 54 feet covering nearly all of the south wall of a brick building. The mural was several years in the making. It began with an international competition sponsored by Allied Arts of Bellingham and sundial enthusiast Sasch Stephens. Ultimately the mural with embedded vertical dial was dedicated on the fall equinox. Called the "First Shadow Celebration" many local celebrities recognized the new mural artwork and old art of sun dialing.
Wildwood New Jersey USA Analemmatic Dial Dial 914
On the boardwalk, inset into the wood planks is a smooth concrete walkway about 12 inches wide. Months and instructions are given in neat lettering made in the concrete. The hours are done on a half-ellipse using the same smooth concrete, Arabic numbers, and 15-minute time marks (far narrower than a person's shadow). The dial is set for daylight saving time (with no longitude correction).
State College Pennsylvania USA Horizontal Dial Dial 913
The Dr. Joel N. Myers Sundial monumental sundial is truly a masterpiece in time. The 11 foot tall black granite gnomon seems to grow out of a larger granite block. Time is marked by the several rows of low, large flat stones, 25 in all. They are set for summer solstice (first row), equinox (second row that has the stones all in a liner), and winter solstice (only for 10am-2pm. The stones themselves are too large for precise time telling, but the use of colored dots painted on the stones allows you to tell exact civil time using the tip of the sundial's shadow on the solstices and equinox.
Greenville Pennsylvania USA Horizontal Dial Dial 912
This bronze dial is about 14 inches in diameter with a coarse near-white patina. Time is delineated in 5 minute intervals from 4:30am to 5:30pm. The hours are marked in Roman numerals and includes a gnomon gap for a fairly thick gnomon. The dial sits on on square stone pillar and thick plinth. Measurement of the gnomon angle agrees with with latitude engraved on the dial plate of 40° 25' that is more than a degree off the latitude of the the dial site.
Carnegie Pennsylvania USA Equatorial Dial Dial 911
Anthony Vitale, a life-long steel worker and internationally know metal sculptor, designed a dial for the place he once worked: Carnegie Steel. He started with a flat length of steel 72 inches long, selected the distance between hour lines to be 6 inches, delineated in 15 minute intervals. The result was an equatorial half-ring 45.836 inches in diameter. He added 3 1/4 inches buffer on each side of the equatorial, creating an outer ring 52 inches in diameter. Along the meridian half-ring, the sun's declination is marked with months when a nodus cross bar casts a horizontal shadow at solar noon. The concrete base can unfortunately be rotated and it seems to point to the magnetic north, but bringing a compass or modern cell phone near the steel armillary instantly creates a distortion.
Sewickley Pennsylvania USA Analemmatic Dial Dial 910
Sewickley is a borough in Allegheny County, Pennsylvania, 12 miles (19 km) west northwest of Pittsburgh along the Ohio River. Riverpark was created in 2010 with a meandering path. At one stop is a plain analemmatic sundial approximately 15 feet across on a gravel bed. Hour markers are granite stones showing 4am-8pm. The analemmatic walkway has engraved abbreviations of the months, looking like granite blocks, but actually clever and beautiful concrete.
Pittsburgh Pennsylvania USA Sculpture/Artwork Dial 909
The memorial is positioned and shaped to capture sunlight through its vertical spaces. While the sun travels the horizon, columns of light shine onto the ground, highlighting words engraved in the stone below that express individual and shared experiences about the war.
Pittsburgh Pennsylvania USA Horizontal Dial Dial 908
This granite memorial octagonal sundial is approximately 5 feet across. The top is unadorned, containing only the delineated hour lines in 15 minute intervals and hour marks in Roman numerals from 5am-7pm. The gnomon has a sharp style
Chatham Village Pennsylvania USA Horizontal Dial Dial 907
This bronze dial is about 12 inches in diameter. The outside chapter ring is delineated in 15 minute intervals with hours shown in Roman numerals from 4am-8pm. The gnomon has the profile of a bird under the style. An hour glass and wings on the dial face symbolize "Time Flies".
Meadville Pennsylvania USA Horizontal Dial Dial 906
This patina dial shows lots of wear. Although it sits on an elegant helical pedestal. The dial has a compass rose and from measurements of both the dial and gnomon, it was constructed for London at 51 degrees. This is further supported by the hour extent from 4am to 8pm. The hours are delineated in irregular 5 minute marks with hours shown as Roman numerals. The 6am to 6pm hour lines should be exactly opposite, but are angled toward the gnomon foot. Unfortunately this dial never kept good time in London and certainly can not tell accurate time in Pennsylvania.
Meadville Pennsylvania USA Horizontal Dial Dial 905
The sun dial was given to the college in 1909 by the Class of '99 as a memorial on their tenth anniversary. It consists of an elegant bronze dial showing time from 6am-6pm delineated in 15 minute increments. Hours are shown in Roman numerals. The gnomon has the number "99" beneath the style. The dial is mounted on a granite pedestal forty inches in height.
Fairport NY US Analemmatic Dial Dial 904
This analemmatic sundial was created in 2017, 200 years after construction on the Erie Canal began. Artist Vanessa Sheldon "created the sundial [hour marks] using salvaged canal stones [from Erie Canal Lock 58]." According to WHAM News the sundial was unveiled by the Fairport Industrial Development Agency and Fairport Public Art Committee. Funding for the project was partially paid for by a $50,000 matching grant through the Finger Lakes Regional Economic Development Council.
Los Rios Santo Domingo Distrito Nacional Dominican Republic Compound Dial Dial 903
This highly decorated monument sundial is composed of three sundials (Horizontal, Polar and Equatorial) with a common gnomon. All of the dials are built mainly of limestone. The large polar dial (wings), small horizontal dial (tail) and gnomon (body) recreate a “hummingbird”, the universal symbol for diabetes. (The hospital specializing in diabetes is only 500m away). The dials are delineated in half hours and have a variety of graphics on all three dials. In the same location, albeit separated there is another equatorial clock that is five times smaller and has a custom gnomon in the shape of the "little hummingbird”; this sundial is mounted on top of a column and has been adjusted to the local solar time. Nearby is a plaque with the equation of time.
Sherman Texas USA Noon Mark or Meridian Dial Dial 902
Outside the library are two stone granite guardians about 12 feet tall. They create a noon marker along a low stone wall set along the solar meridian. There are three markers rods set horizontally across the top of the wall that catch the shadow of a horizontal bar set between the two granite pillars. The shadow falls on the farthest horizontal rod on the wall at winter solstice. During the summer solstice, the shadow falls on the nearest rod to the granite block. And on the spring and fall equinox, the shadow falls on the middle rod.
Pelham Manor New York US Vertical Dial Dial 901
This south facing vertical dial is 4x2 feet made of concrete, now slightly brown with age. The graceful gnomon is white-painted metal. Hour numbers in Roman numerals extend from 6am to 6pm without further delineation.
Palo Alto California USA Horizontal Dial Dial 900
This horizontal bronze dial is 14.5 inches in diameter, mounted on a fluted pedestal. The gnomon angle is set for the latitude and is 5 5/8 inches tall. Graceful hour lines extend from 5am to 7pm marked by Roman numerals. It is delineated only with half-hour lines. Surrounding the dial face is a zig-zag decoration.
Santa Cruz Island California USA Vertical Dial Dial 899
This vertical dial has undergone a number of restorations since it was set in lime in 1889. A photograph from 1900 shows the placement of a gnomon rod is horizontal. In 1992 before the National Park Service restoration in 2012 the gnomon is set in a polar orientation. But it doesn't really matter since the hour lines are marked at nearly regular 15 degree intervals with half hour sub-marks.
Webster Groves Missouri USA Horizontal Dial Dial 898
This horizontal sundial is mounted on a hexagonal graceful concrete pedestal 43 inches high. The top of the pedestal is slightly sloping hexagonal 17 inches on a side. The circular bronze dial at the center is 11 inches in diameter. The hour lines meet a chapter ring with time marked in 15 minute intervals. Roman numerals mark the hours from 6am to 6pm. The 5 1/2 inch gnomon is of badly rusted steel, with iron stains covering the central part of the dial face. The sundial was vandalized at some time in the past and the original gnomon stolen.
Frankenmuth Michigan USA Vertical Dial Dial 897
The dial is elegantly painted on the south wall declining 30 deg west. Dial shows daylight savings time using dark red Roman numerals on a golden ribbon banner. The gnomon is a simple rod held firmly to the wall by an ornate bracket. Above the dial is a large smiling sun surrounded by a sky blue band.
Frankenmuth Michigan USA Armillary Sphere Dial 896
This is a mass produced armillary dial held at the latitude of Frankenmuth by the statute of a boy with raised arm. All this sits on a pedestal with a Greek motif. The meridian circle made of iron is about 2 feet in diameter. The equatorial band is about 3 inches wide with some corrosion present. Inside the equatorial there appears to be an aluminum interior band of Arabic numbers riveted to the equatorial. Hours and half hours are marked by dot bumps in the aluminum. There is an iron latitude ring for decoration. The bronze gnomon extends the meridian circle with both an arrow point and feathered tail.
Opp Alabama USA Equatorial Dial Dial 895
An equatorial sundial made of diesel engine parts by the students of Lureen B. Wallace Community College, under the guidance of Eddie Spann, instructor for diesel and heavy equipment and designed by the college president, Dr. Herbert Riedel. The stand is a crankshaft from a Cummins engine, while the dial base and dial faceplate are flywheels. The gnomon is a heavy duty diesel cylinder liner puller. The gear teeth on the faceplate mesh with a small gear to allow easy adjustment for the equation of time. Hours are marked by bolts, and on the winter side are painted hour numbers.
Andalusia Alabama USA Reflective Equatorial Dial 894
This dial is one of Bill Gottesman's uniquely designed Renaissance dials of cast and structural bronze with a 27 inch diameter time telling helix whose axis is aligned to the celestial-north pole. Time is told by a focused beam of light from a long cylindrical unsilvered mirror situated on that N-S axis, reflecting sunlight into a slit of light onto the helix, telling time throughout the day. A sliding time scale within the helix is adjusted for longitude, date's equation of time correction and daylight saving time. Once this scale is adjusted for date, the dial shows civil (local clock) time with an accuracy of under one minute. The dial base is cast bronze that allows adjustment for latitude and is placed on a sandstone plinth.
Opp Alabama USA Equatorial Dial Dial 893
This 2-foot diameter equatorial disk is of quarter-inch aluminum plate with hourly time marks cut through with slots. Shorter slots mark half our and fifteen minute intervals. The noon mark is surrounded by short holes made at five minute intervals. At the top of the dial is a cut fleur de lis.
Grand Rapids Michigan USA Analemmatic Dial Dial 892
The brightly colored analemmatic dial is approx 10.5 feet in diameter, surrounded by a ring of alternating red and white concrete with cardinal points. Time marks are set in a ring of black concrete, with large engraved hour numbers. Time is adjusted for daylight saving time.[Note that to tell time correctly, the time marks should be set on an ellipse.] The walkway for standing to cast your shadow has monthly names impressed into the concrete.
St. Louis Missouri USA Horizontal Dial Dial 891
This horizontal sundial is part of a sculpture set, formed as a lily pad, and surrounded by three circular flowers with centers that are small water fountains (no longer working). The dial face is no longer flat and the graceful gnomon does not point true north. There is a short cylinder at the end of the gnomon with a hole, perhaps for casting a beam of light on a certain day. The hole is at a 34.4 deg angle, aiming toward the slot in the dial face. Now, the dial is located in dense shade preventing operation.
Palo Pinto Texas USA Horizontal Dial Dial 890
The 21 inches in diameter sundial started as a sculpture. A call went out to the boy and girl scouts (and alum men and women) to contributed fossils, and other artifacts. This included an arrowhead found at camp. These objects were incorporated into the finished wax, with the arrowhead embedded on the style edge at the very tip of the gnomon. A mold was taken of the completed sculpture and used to create a casting wax replica of the sculpture.
St. Louis Missouri USA Horizontal Dial Dial 889
Sitting on a classic sundial pedestal is the Concordia sundial made of thin bronze plate in the shape of a hexagon about 8 inches between opposing sides. Hour lines radiate from where a thick gnomon would have stood, with Arabic numbers from 4am to 8pm counting the hours. The gnomon had gone missing in 2009 when the dial was vandalized. A new gnomon fitting the position of the old was designed by Don Snyder of St. Louis and made of bronze plate by William Turner of Turner & Associates, a metalworker also of St. Louis.
Monegaw Springs Missouri USA Unknown Dial 888
This compass is carved in rock showing cardinal points. For some reason the N mark is backward and a W mark is upside down. A surrounding circle of 10 inches in diameter defines most of the compass. A smaller circle encompasses the letter N and a partial circle carved from the center is approximately 4 inches in diameter.
Natchez Mississippi USA Horizontal Dial Dial 887
In 1716 the French built a fort on the bluffs of Natchez and named it Rosalie in honor of the Countess of Pontchartrain. In 1820 Peter Little, who came to Natchez from Pennsylvania in 1798 at the age of 17, purchased a portion of that land on which to build his home. He decided to keep the name Rosalie in honor of the fort and its settlers. The mansion and land was purchased in 1938 by Mississippi State Society, Daughters of the American Revolution.
Ridgeland Mississippi USA Vertical Dial Dial 886
This is a small 7 x 10 inch vertical dial declining due south. It is made from wood with hour lines, half hour lines, and Roman numerals engraved using a wood burning tool. The simple gnomon is 1/8 inch steel.
St. Louis Missouri USA Obelisk or Vertical Gnomon Dial 885
The obelisk is constructed of North Carolina pink granite. At the base it is 18 x 16 inches and soars 18 feet into the sky. The obelisk displays a cross in its own shadow at solar noon on three days each year – the vernal equinox on about March 21, the summer solstice on about June 21, and the autumnal equinox on about September 22.
Wills Point Texas USA Horizontal Dial Dial 884
This starburst sundial is 6-3/4 inches in diameter, made of 1/8 inch aluminum plate. The dial is actually set in a 12-point compass rose, showing the azimuth every 30 degrees. Time marks are every 15 minutes with hours in Arabic numerals. All marking, latitude, longitude, and inscription are engraved into the dial plate.
St. Louis Missouri USA Horizontal Dial Dial 883
The circular bronze dial sits on an iron pipe, surrounded by a picket fence and protected from the elements by a brass hood. It is a nearly identical dial to the one at the St. Louis Arsenal (NASS dial #847), and was manufactured in the same year, 1859. It is likely that master armorer N. Engels, machinist A. Schaedel, and engraver W. Hawksley created this dial. The Old Courthouse Dial measures 17 inches in diameter, has a large unadorned triangular gnomon, and on the plate has hour lines from 6am to 6pm delineated every 15 minutes. There is a curious second set of hour lines at the top of the dial plate from 10am to 2pm. Hour numbers are in Roman numerals. There are no other engravings on the dial.
Perryville Missouri USA Horizontal Dial Dial 882
The square 14.5-inch dial is made of while milk stone with graphics highlighted using lithochrome paint. The gnomon is made of stainless steel 303-alloy and has the letter P held between the base and style. The dial sits upon a square frustrum pedestal 3-feet tall, 24-inches square at the base, tapering to 17.5-inches at the top. The pedestal is supported on a 32-inch square base.
La Canada California USA Armillary Sphere Dial 881
The bronze equatorial dial is about 24" diameter, and has equatorial, meridian and horizon rings. It sits on top of a stone pedestal. The equatorial ring is supported by 24 spokes, spaced at 15 degrees. Around the rim 24 hour numerals in Arabic. The twelve signs of the zodiac are spaced every other hour on the equatorial rim. The orientation to true north and inclination were verified to be correct for the site. The sundial was a gift from the Kresser Smith family to the Descanso Gardens Guild in 1987 on the occasion of the guild's 30th anniversary.
Washington District of Columbia USA Horizontal Dial Dial 880
This simple bronze sundial about 12 inches in diameter sits on a 3-foot fluted plinth made from Indiana limestone. Embossed hour lines extend from 5am to 7pm delineated every 15 minutes. Surrounding the hour chapter are Roman numerals with the noon hour marked by "0". The gnomon is very attractive, with a bird ensconced between the style and base. The dial was given to Howard University by the Lampados Club of Alpha Chapter, Omega Psi Phi Fraternity in 1929 to honor Benjamin Banneker, 18th century astronomer, surveyor and executing architect of the District of Columbia.
Danville Vermont USA Vertical Dial Dial 879
A simple vertical dial created on the front brick wall of the high school. There are no hour lines, but large Roman numerals are placed from 10am to 5pm to delineate the hours using Daylight Saving Time (where the 1pm hour is on the vertical). The gnomon is a simple rod.
Regina Saskatchewan Canada Vertical Dial Dial 878
This vertical dial is mounted directly onto the stucco wall of the house. The gnomon is a triangle of aluminum cut from 3/16 inch sheet, with a 2-inch hole as a breather to relieve stress from cross winds. More interesting are the hour lines, made of a double strand of heavy copper wire, with each extending from winter to summer solstice, held with pegs (from Canadian Tire). A middle peg shows the equinox as well. Hour lines extend from 7am to 6pm, shown in simple Arabic numbers. The sundial is operational in clear weather from 8:30am - 6pm through all seasons.
Williamsburg Virginia USA Armillary Sphere Dial 877
This armillary is constructed of welded carbon steel narrow bands approximately 4-feet in diameter sitting on an iron post about 3-feet high. The equatorial band has no engraved or embossed time marks, but the simple rod gnomon has two side rods. According the the WPL website, "Time on the sundial is read by looking at where the gnomon shadow is cast. This shadow will be the middle, thicker shadow of the three shadow-lines ... Although hours are not marked off on this sundial, you can estimate the time of day by thinking of the gnomon shadow hoop as the clock face and the shadow as the hour hand of that clock." Well, not exactly. The hours are at 15-deg intervals with 12 noon at the bottom of the equatorial band at the intersection of the meridian band. This armillary is more of a sculpture than a timepiece. Yet the armillary has the traditional tropic of Capricorn and Cancer bands as well as Arctic, Antarctic,and horizontal bands.
Hawthorn Woods Illinois USA Equatorial Dial Dial 876
This equatorial dial sits on a 61-inch octagonal base that serves as a columbarium. The dial is reminiscent of Erickson Memorial sundials. This granite sundial is 38.5 inches in diameter and 6 inches thick. The 3-inch diameter gnomon is made of hollow galvanized steel pipe with a white powder coating. The engraving on the sundial was done using a rubber stencil and sandblasting with aluminum oxide abrasive. No water jet was used. The center core hole was cut using a diamond segmented coring machine, like a big drill press with an expensive hole saw.
Lancaster Pennsylvania USA Heliochronometer Dial 875
This 7.5 inch diameter heliochronometer was milled out of aluminum and set to the site latitude with a mounting plate. One heliochronometer arm has a sun illumination counter sunk hole 0.125 inch in diameter and on the other arm an engraved analemma for proper pointing offset to display civil time. Time marks are milled at 5 minute intervals, and a vernier is added (5 lines 4 minutes apart) so that time can be read to the nearest minute.
Windsor Ontario Canada Vertical Dial Dial 874
A vertical stone sundial made of white quartzite approximately in a 6 x 4 feet rectangle. The dial face includes engraved hour lines from 7am to 6pm in Arabic hour numerals for Eastern Daylight Time and an elegant engraved outline of St. Dimitrije based on a partially preserved 14th century fresco of the Saint in St.Mary's Church, Donja Kamenica, Serbia. Rather than summer and winter solstice lines, a single hyperbola indicates the route of the gnomon shadow's tip on 8 November - the day of St.Demetrius (St. Dimitrije). In fact, the gnomon is represented at St. Demetrius' sword (or more appropriately, his spear). A small bell is engraved at 10am indicating the time of morning liturgy. At about 11:15 if you look closely, you can see the subnode point (polos montaza) of the gnomon tip used for alignment during construction.