Sundials - World's Oldest Clocks

North American Sundial Society

Selected Sundials of Colorado

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Golden Colorado USA Reflective Equatorial Dial 855
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.
Littleton Colorado USA Equatorial Dial 511
The Littleton War sundial is an Erickson equatorial polar dial 6 feet in diameter made of light granite with a 3 inch steel rod as gnomon. Time is graduated by hour, half-hour, quarter hours and 5 minute marks over 24 hours. Noon is at the bottom, matching the 105 degree meridian. Designed to be read from the upper surface in Spring/Summer, from the under side in Fall/Winter. A plaque provides the Equation of Time to convert solar time to watch time. Dial is in a beautiful setting.
Pueblo Colorado USA Stonehenge Dial 200
Stonehenge type dial designed by Judy Guttormsen and built in 1984 . Stonehenge itself an amphitheater. If you stand on a brass marker in the center of the stage, on the solstices and equinoxes, you can observe the rising and setting of the sun aligned with metal posts viewed through slits in the wall. At the south edge of the site is a 6 foot horizontal dial laid out in the concrete floor. There are two rings of numbers, one for standard time, one for daylight time. Not corrected for longitude, but the location is very close to the center of the time zone. The gnomon is cement and is unusually thick (approximately 40 cm), making it very sturdy, presumably to prevent vandalism. The surface of the gnomon is very rough, having embedded pebbles, making it an uncomfortable place to sit or climb. The metal inscription plate on the gnomon has faded too badly to read. The site also has a North Star finder made of wrought iron and has a small bench for children to use.
Steamboat Springs Colorado USA Equatorial Dial 225
A large 6 ft. spherical of structure with two 270 degree arcs that intersect and right angles.