Sundials - World's Oldest Clocks

North American Sundial Society

Selected Sundials of Illinois

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Chicago Illinois USA Collection Dial 119
Mensing Collection
Chicago Illinois USA Collection Dial 120
John C. Tomlinson Collection
Chicago Illinois USA Equatorial Dial 223
Henry Moore Sundial Sculpture: 13 foot bronze equatorial dial built in 1980. Two bronze semicircles, one set inside and at right angles to the other, form the main elements. A slim rod runs from one end of the outer semicircle to the other end and its shadow on the inner semicircle below marks the time of day. EOT correction is provided.
Chicago Illinois USA Equatorial Dial 228
Equatorial in bronze. 2 meters in diameter. Arabic hour numerals. Hour scale is subdivided into 5 minute intervals.
Chicago Illinois USA Equatorial Dial 271
ca 8' dia. Stone ca 7' high Two curved C shaped forms placed at perpendicular angles.
Chicago Illinois USA Horizontal Dial 296
Approximately 4 foot diameter. A cement disk with a cleft at the top acts as a sundial. Cement, wood.
Collinsville Illinois USA Woodhenge Dial 94
At the Cahokia Mounds is a woodhenge discovered in the early 1960's during excavations and has been reconstructed. There are a series of wood posts in multiple circles that indicate various solar events such as the solstices, equinoxes, and what are thought to be special festival days related to the agricultural cycle of the region. Critical posts also align with the mounds of the site on certain dates. The outer of 3 circles of posts has a diameter of 410 feet with 48 equidistant posts. Each post is about 20 feet high. Equinox and solstice sunrise observations are held at the site on the Sunday morning closest to the event.
DeLand Illinois USA Four-dialed pillar Dial 360
Granite four-dialed pillar about 5 foot high, possibly dating from the mid 17th century. Purportedly found in 1650 in Tinturn, Monmouthshire, England, and consistent with the dial latitude of 52 N. Dial face is 18 x18 inches. Gnomons on both east and west sides are turned off its original declination. A gift from Robert H. Allerton. The dial is well-traveled, and was brought to the United States in 1890 by the John Wanamaker stores. The fascinating history of this dial can be found in NASS Compendium Vol. 6 No. 1, Dec., 1998.
Evanston Illinois USA Horizontal Dial 298
This was once a horizontal sundial of unknown construction commissioned by the Works Progress Administration. The dial has been removed and only a 24x24 inch pedestal remains, now adorned by a flower pot.
Graylake Illinois USA Stonehenge Dial 521
"Sun Pivot" is a set of vertical "gatestones" that allow the viewing of two major solar alignments: The summer sunrise stone is set about 33 degrees north of east while the equinox stone is set due east. The angular cuts in the gatestones allows the framing of the sunrise event above the stones, which are set about 200 feet away in a field of prairie grass.