A closer look: Koester Memorial Sundial at SDSU.

The Koester Memorial Sundial stands prominently in San Diego State University’s Campanile Mall, directly in front of the iconic Hepner Hall. I took photographs of the sundial when I walked through the SDSU campus a few days ago. A couple of corroded plaques invite a closer look.

According to this article, dedicated on November 4, 1978, the Gübelin Equatorial Sundial [is] in memory of the late George A. Koester…

Koester began his career at San Diego State in 1950 and went on to complete 14 years as a professor of education and 10 years as executive dean. During his time on Montezuma Mesa, Koester played a prominent role in building the campus, working on the creation of Love Library, the music and drama buildings, Aztec Center, Zura Hall, student health services, and multiple parking structures…

A plaque embedded in the brick pedestal states:

IN MEMORY OF GEORGE A. KOESTER Ph.D – PROFESSOR OF EDUCATION – EXECUTIVE DEAN – IN APPRECIATION OF HIS SERVICE TO THE UNIVERSITY 1950 – 1974 – PRESENTED BY HIS FRIENDS, COLLEAGUES AND FAMILY

Within the sundial, a faded plaque (I increased the image contrast) describes how the beautiful and fascinating device works. I transcribed as best I could, without every word in caps:

THE KOESTER MEMORIAL SUNDIAL

The sundial indicates local apparent time. Two steps are necessary to convert sundial time to Pacific Standard Time: one to correct for the longitude difference between SDSU (117°04`2W) and the central meridian of the Pacific Time Zone (120°W), and the other to correct for the non-uniform motion of the sun (equation of time).

The design of the sundial automatically makes the first correction. The image of the sun will be between the two lines (correct noon) just to the left of the XII noon line when the sun crosses the meridian at SDSU (117°04`2W) and on the XII noon line 12 minutes later when the sun crosses the central meridian (120°W) of the Pacific Time Zone.

To determine the equation of time for today, locate today’s date along the top or bottom the curved brass plate. Taking the distance between each vertical line as being 10 days, then move straight up or down to the corresponding point on the blue line. Move horizontally from this point left or right to the time scale and determine the number of minutes to be added (+) or subtracted (-) from the time indicated by the bright spot on the sundial. The distance between each vertical line is now taken as being 20 minutes. One hour must also be added if Daylight Savings Time is in effect.

Whew! Got that?

I think I’ll stick to my wristwatch or phone!

…

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