Sundials - World's Oldest Clocks

North American Sundial Society

Boise  

Sundial 344
State/Province:  Idaho Country:  USA
Dial Type:  Equatorial Condition:  New 1998
Latitude:   43° 36' 47" N Longitude:   116° 13' 26" W
Location:
  • Ann Morrison Park on "Duck Island". Enter park through west entrance from Americana Blvd. Turn immediately right toward water and park near small footbridge going to island. Dial is easily visible.
 
Description:
  • Equatorial dial 5 ft high, 6 ft. wide and 4 ft. deep. The dial was designed by Pete Swanstrom, built and donated by JST Custom Fabrication Inc. of Boise. The gnomon is of unusual design with a central pivoting elliptical plate and analemmatic cut out. The analemma is marked with 365 individual date marks. Shadow falls on equatorial ring with hours marked from 7am to 7pm and inscribed with lines for every minute (spaced 1/7 inch apart). Indicates time to less than 15 seconds, making it among the most accurate sundials in the world. Indicates true time to the minute, date to the day, and adjusts for Daylight saving time. The Latin inscription should read "Tempus Captum" rather than "Tempus Captus".
 
General Information:Inscription:
  • Owner: Boise City Parks Department
  • Tempus Captus. Pete Swanstrom 1997
  • Designer: Pete Swanstrom
  • Builder: JST Custom Fabrication Inc. Boise, Idaho
  • Construction Date: 1998
 
References:
  • NASS Compendium, Vol 5 Nr 4, Dec 1998