Sundials - World's Oldest Clocks

North American Sundial Society

Redlands  

Sundial 658
State/Province:  California Country:  USA
Dial Type:  Vertical Condition:  Very good
Latitude:   34° 03.830' N Longitude:   117° 09.685' W
Location:
  • University of Redlands
    Appleton Hall for Physics, Mathematics and Computer Science
    1200 E. Colton Avenue
    Redlands, California
 
Description:
  • A 60x40 foot vertical dial of stucco, wood and brass, filling the south exterior wall of the building. Roman hour numerals show PST; Arabic hour numerals show PDT. Summer and winter solstice and the equinox lines are shown; the shadow of a nodus on the gnomon indicates the date.

    Dr. Nordgren explains that the shadow of the 10-inch diameter nodus "is just the right size to take into account periods when sundials are fast or slow relative to clock time. When dials run their slowest, the leading edge of the nodus shadow gives the accurate time. During periods when dials run their fastest the trailing edge gives the accurate time."

    Dr. Nordgren was among the seven designers of the sundials used on the NASA Mars Rovers in 2004.
 
General Information:
  • Owner: University of Redlands
  • Designer: Dr. Tyler Nordgren, Associate Professor of Physics at University of Redlands
  • Builder:
  • Construction Date: 2006
 
References:
  • Riverside (Calif.) Press-Enterprise newspaper story published 11:44 p.m. PST on Fri., Nov. 25, 2005 on building complex.
    http://www.pe.com/localnews/sanbernardino/stories/PE_News_Local_M_bbuildings26.1d2dea57.html