Ultraviolet sundial
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United States of America Patent
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-
Nov 19, 1996
Grant Date -
N/A
app pub date -
Dec 16, 1994
filing date -
Dec 16, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for indicating the percentage of ultraviolet radiation which reaches the earth's surface for a given position of the Sun's altitude. The device consists of a planar member having a gnomon-like member affixed within its center. The gnomon-like member marks the center of nine (9) spaced concentric rings inscribed on a top surface of the planar member. The innermost circle is labeled 90%, the second 80% and so on to an outer edge. The radius for the circumference of each ring is calculated by a mathematical formula which correlates the altitude of the sun with a percentage amount of UV-B that reaches the surface of the earth.
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