Sundials - World's Oldest Clocks

North American Sundial Society

Tucson  

Sundial 735
State/Province:  Arizona Country:  USA
Dial Type:  Projection Condition:  Excellent
Latitude:   31° 57.505' N Longitude:   111° 26.379' W
Location:
  • Kitt Peak National Observatory
    Visitor Center Patio
    56 miles southwest of Tucson on State Highway 386 on the Tohono O'odham Indian Reservation
 
Description:
  • A fused silica glass spherical lens projects a solar image spot onto the inner surface of a spherical segment of glass with a frosted area inscribed with hour lines and Arabic hour numerals. Time is read from the bright spot of light on the frosted surface while standing under the dial. Dial is mounted atop a pipe pillar on the patio of the Visitor Center.
 
General Information:
  • Owner: AURA/NOAO
  • Designer: Dr. Stephen F. Jacobs
  • Builder:
  • Construction Date: 1997
 
References:
  • "Sun Clock Illuminates Sphere Optics," Photomics.com, June 2005
    Optics & Photonics News, October 1997

Last Revised: 6/16/2013 10:15