Sundials - World's Oldest Clocks

North American Sundial Society

Golden  

Sundial 855
State/Province:  Colorado Country:  USA
Dial Type:  Reflective Equatorial Condition:  Excellent
Latitude:   39° 44.4312 N Longitude:   105° 10.1083 W
Location:
  • Dial is located in front of the National Renewable Energy Laboratory's Education Center at 15013 Denver West Parkway, Golden CO 80401

    From Interstate 70 (heading west), take exit 263 to Denver West Parkway.
 
Description:
  • 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.
 
General Information:Inscription:
  • Owner: National Renewable Energy Laboratory
  • The Renaissance Dial was a gift to the National Renewable Energy laboratory from friends and members of the Sustainable Buildings Industry Council in tribute to Don Prowler, extraordinary architect, and educator who left a lasting impression through his work in solar energy and building design.
  • Designer: Bill Gottesman of Precision Sundials
  • Builder: Bill Gottesman
  • Construction Date: June 2007
 

Last Revised: 2017-03-22 01:18