Great Circle Studio

Custom crafted Sundials.

horizontal sundial model image

A Sundial of high accuracy and beauty, precision made for your specific location to uniquely identify your garden with an enduring piece of functional art. The Sundial is custom made from polished granite, inlaid with an original bronze ring of Zodiac reliefs and mounted on a uniquely designed cast iron column.

SunClock indicating approx. 12:15PM.
[SunClock Image]

The Porter SunClock shown above was purchased by me in Connecticut in July, 1998 right after attending Stellafane in Springfield, VT. The design is very unique in that it employs two optical elements (not shown), the first, a lens, is used to image the NCP (North Celestial Pole) and thereby align the polar axis shaft (held above the figurine) the second, a mirror, is used to image the Solar disk onto the Analemma. The mirror is mounted at a 45 degree angle to the polar axis shaft and thereby aligns the reference plane of the celestial equator at right angles to the polar axis. When the Sun is on the equator (the Equinoxes) the imaged rays will be parallel to the polar axis. The polar axis shaft alignment to the NCP is obviously done at night. To read the time a knob at the back of the SunClock, which drives the internal gear train, is turned until the image of the Sun's disk bisects the portion of the Analemma that corresponds to the current date. As such, the SunClock also functions as a rough calendar, being most accurate (to within a couple days) on dates close to the Equinoxes (when the declination rate is fastest) and the least accurate (to within several days) on dates close to the Solstices (when the declination rate is slowest). For the SunClock to display Standard Mean Time the time difference between the Local Meridian and the Standard Time Zone Meridian must be accounted for by adjusting (only once) the minute hand by the corresponding amount. Efforts to reproduce the SunClock in bronze are already under way.

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Great Circle Studio
PO Box 675
Pacific Grove, California

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Last Update: Jan 2011
© 1996-2011, Great Circle Studio
LJ Coletti