Sundials - World's Oldest Clocks

North American Sundial Society

Selected Sundials of Alabama

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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.
 
 
Tuscaloosa Alabama USA Equatorial Dial 189
A 5 foot bronze and steel equatorial dial with pinhole gnomon in front of the North River Yacht Club.