Sundials - World's Oldest Clocks

North American Sundial Society

Colorado Springs  

Sundial: 222
State/Province:  Colorado Country:  USA
Dial Type:  Analemmatic Dial Condition:  Excellent
  Latitude and Longitude: 38° 59.655' N  104° 51.825' W
Location:
  • Located on the grounds of the US Air Force Academy, at entrance to the planetarium and Center for Educational Multimedia
    2121 Cadet Drive
 
Description:
  • Analemmatic dial in granite and bronze. 9ft x 12ft. Mottled granite block surface with number border of smooth granite blocks. Hour numbers are engraved in granite. Zodiac marker is brass, embedded in the granite face. As with most analemmatics, the dial is not corrected for longitude. Fortunately, the location is very close to the center of the time zone at 105 deg W. User stands on a central analemma at correct date and acts as the gnomon to cast a shadow that points to local solar time. The aspect ratio is not correct for the latitude and the positions of the solstice markers are slightly off.
    Major semi axis: 289.56 cm
    Minor semi-axis is 175.89 cm (should be 182.31 cm)
    Summer Solstice is 81.92 cm (should be 97.82 cm)
    Winter Solstice is 83.82 cm (should be 97.82 cm)
 
General Information:Inscription:
  • Owner: USAF
  • Instructions: STAND ON TODAY'S DATE AND YOUR SHADOW POINTS TO THE TIME
  • Designer:
  • Builder:
  • Construction Date: 1985
 

Last Revised: 2019-02-09 16:45
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