Sundials - World's Oldest Clocks

North American Sundial Society

Selected Sundials of Washington

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Stevenson Washington USA Equatorial Dial 707
An approximately four foot diameter equatorial ring dial of natural stone and steel with an analemmic gnomon. Equatorial ring has hour and 15 minute marks with Arabic numeral for PST and PDT. A plaque indicates how to read the shadow of the gnomon, shows primary directions and identifies the dial designer. Plaque includes an analemma showing the equinoxes and solstices and states the dial is accurate within 2 minutes year around. Since the dial includes an analemmic gnomon, no application of EOT correction is needed.
Vancouver Washington USA Equatorial Dial 659
A 2 meter diameter ring equatorial dial of welded anodized aluminum plate. The dial face shows Arabic numerals with hour and quarter-hour marks. This face can be moved for longitude correction and DST, and was originally adjusted to correct periodically for EOT. In 2009, the original straight gnomon was replaced with an analemmic gnomon, eliminating the need to adjust or correct for EOT.