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Morton Analemmatic Sundial
An Analemmatic Sundial is one where the gnomon's position is varied through the year. The base is moved along a path like a flattened figure eight, to compensate for the apparent loop in the sky that would be seen if the absolute position of the sun's zenith were to be plotted up there.
In this sundial one follows the instructions to stand upon the inscribed base according to the month of the year, and the shadow of one's body falls upon one of the numbered hour-stones laid out in an elliptical arc around the base.
Mathematical descriptions include a fixed height for the Gnomon, but so long as the gnomon is longer (that is, taller) than the semi-major axis then its shadow will intersect the elliptical arc and be perfectly understandable.
The hour stones are, of course, placed according to UTC. No allowance is provided for summertime.
The whole thing is discretely placed in the wide grass verge of the High Street, with a small explanatory plaque on a nearby barn wall.
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