Sundials - World's Oldest Clocks

North American Sundial Society

St. Louis  

Sundial: 918
State/Province:  Missouri Country:  USA
Dial Type:  Horizontal Dial Condition:  Excellent
  Latitude and Longitude: 38° 41.254' N  90° 13.766' W
  • Bellefontaine Cemetery, St. Louis, Mo.
    The sundial is accessible during open hours of Bellefontaine Cemetery for viewing by the public.
  • The dial plate is a 16 x 16 inch square piece of milk glass, with the hour lines and Arabic numerals made by sandblasting through a photo-etched stencil and then spraying black with lithichrome paint into the etchings. The triangular gnomon is made of 3/8 inch thick stainless steel. Saint Louis sculptor Abraham Mohler made the pedestal from EW Gold limestone quarried near Ste. Genevieve, MO. It is 18 x 18 inches square and 40 inches tall.

    Comment on Photo #3: The photo was taken at 3:54 PM CDT on Sept. 15. The solar time shown by the dial is exactly 3 PM. SolarTime = CivilTime - Longitude – EOT used CST = 2:54, Longitude from Time Meridian = 0:0:55, and the Equation of Time = 0:4:30 on Sept. 15, the result is SolarTime = 2:59:25, indicating that the dial displays solar time to good accuracy.
General Information:Inscription:
  • Owner: Mackey Family
  • On the Pedestal:
    In Memory of
    Eugene J. Mackey, III
    Architect, Planner, Visionary
  • Designer: Don Snyder
  • Builder: Abraham Mohler
  • Construction Date: Installed Sep 10, 2018

Last Revised: 2018-09-30 19:53

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