Sundials - World's Oldest Clocks

North American Sundial Society

Pasadena  

Sundial 643
State/Province:  California Country:  USA
Dial Type:  Analemmatic Condition:  Excellent
Latitude:   34° 08.217' N Longitude:   118° 07.417' W
Location:
  • California Institute of Technology
    Pasadena, California
    South of Winnett Student Center
 
Description:
  • A 14x8 foot analemmatic dial with an 8x2 foot gnomon-positioning calendar plinth. The dial is installed in the pebble and concrete patio of the Winnett Student Center. The hour markers and calendar line plinth are made of Granodiorite of Knowles, a muscovite-bearing biotite granodiorite rock quarried from Knowles Quarry at Raymond, California. A nearby wall plaque provides longitude and EOT correction. The dial is a gift from the Caltech Alumni Association as a sculpture, a public artwork and a scientific instrument. This dial is located on the private university campus but the public may walk on the campus grounds to view the dial.
 
General Information:Inscription:
  • Owner: California Institute of Technology and Caltech Alumni Association
  • CALTECH ALUMNI ASSOCIATION
  • Designer: Dial design by Bob Kieckhefer and Ponzy Lu; graphic design by John O'Brien
  • Builder: John O'Brien and Mike Gilbert, Inc.
  • Construction Date: 8-May
 
References: Web Links:
  • Construction photos by Elizabeth Allen
    Aerial photos and plaque photo by Robert Wedemeyer
    Rock description by Paul Asimow