Friday, August 14, 2009

Suffern Sundial

The Suffern Free Library has a sundial outside its main entrance. It is aluminum. The dial is reading about 10:30 on the upper dail face.

There are two gnomons on this dial. One is the very large triangle making up the body of the dail. The other is the hemisphere mounted on the triangular base. The shadow of the triangle falls on the dias the dial sits on. A thin strip over the circular part casts a shadow on curved dail.

There's a disk on secondary gnomon which can be used to track the height of the sun (which doesn't show up in these photos).
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