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San Ramon
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Sundial 726
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| State/Province: California |
Country: USA |
| Dial Type: Equatorial |
Condition: Excellent |
| Latitude: 37° 45.486' N |
Longitude: 121° 57.623' W |
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| Location: |
- Chevron Corporation Headquarters
6001 Bollinger Canyon Road
San Ramon
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| Description: |
- A 5x5x6.5 foot stainless steel equatorial heliochronometer dial with internal cam mechanism to correct for EOT. This exceptional dial is made of welded stainless steel sheet and weighs 255 pounds. The dial face of the 60 inch diameter equatorial ring is marked with hour, half-hour, 15 minute, 5 minute and one minute lines and Arabic hour numerals showing PST and PDT.
An internal cam-operated mechanism is adjusted by an exterior knob that when turned tilts the entire dial about the celestial north polar axis to implement EOT correction. A window below the equatorial ring displays the date set. The dial is accurate within 20 seconds throughout the day.
The dial was built and originally installed in La Habra, California but when that Chevron facility closed the dial was moved in 1999 to San Ramon, California, about 4 degrees north and west in latitude and longitude. The base was leveled at the new location and the dial never showed correct time due to the location change. NASS member Dudley Warner in 2011 worked with Chevron to modify the base mounting to tip the dial pedestal both south and east to correct for the new location. Opposed radiused nuts securing the base plate to the foundation studs secure the pedestal at its tilted position.
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| General Information: | Inscription: |
- Owner: Chevron Corporation
| - THE HELIOCHRONOMETER
SUNDIALS WERE MAN'S PRIMARY TIMEKEEPERS FOR AT LEAST 5000 YEARS. THE HELIOCHRONOMETER, THE MOST ACCURATE KIND OF SUNDIAL, SYMBOLIZES MAN'S CREATIVITY AND OUR COMMITMENT TO EXCELLENCE IN SCIENCE AND ENGINEERING.
33° 54' 55" N 117° 58' 05" W CHEVRON OIL FIELD RESEARCH COMPANY 1983
A second plaque commemorates its relocation and gives the new location as 37 Deg 47' 29.3695" N 121 Deg 57' 37.4826" W
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- Designer: Chevron Oil Field Research Company
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- Builder: Chevron Oil Field Research Company
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- Construction Date: 1981-1983
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