Geometrical instruments – Straight-line light ray type – Celestial
Patent
1997-12-05
2000-01-04
Bennett, G. Bradley
Geometrical instruments
Straight-line light ray type
Celestial
G04B 4904
Patent
active
060096284
ABSTRACT:
The present invention is a sundial having first and second spaced parallel planar projection surfaces, the first projection surface defining a summer projection surface and the second projection surface defining a winter projection surface. A gnomon extends perpendicularly between the summer and winter projection surfaces. The gnomon is positioned relative to the summer and winter projection surfaces so that with the sundial in an operative alignment with the parallel projection surfaces parallel to the equatorial plane of the earth, on sunny days a shadow is cast by the gnomon on the summer projection surface during those days when the sun rises above the equatorial plane in the northern hemisphere and a shadow is cast by the gnomon on the winter projection surface during those days when the sun does not rise above the equatorial plane in the northern hemisphere.
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