Universal sun-path dial

Details Universal sun-path dial Universal sun-path dial

1991-10-07

1993-02-16

Mancene, L. Gene

Education and demonstration

Geography

Means indicating time at different points on earth

434402, 434284, G04B 1922

Patent

active

051866307

ABSTRACT:
The invention described herein is a mechanical device that appearing uncrowded with lines, numbers, and other markings, depicts the sun's daily path and gives sunlight information, for any interested latitude, date, and time.
A major dial is rotated on a base according to the latitude; a sun-path slider is slid on the major dial according to the date. Then the device depicts a two-dimensional, elevation view of the sun's daily path, as a straight line, through all or some of these five zones in the sky: direct sunlight; civil, nautical, and astronomical twilights; and night.
The depicted sun's daily path gives the following sunlight information: the directions and times of sunrise and sunset; the times of the beginnings and endings of the twilights. On the depicted sun's daily path, the sun's position, indicated by a sun-position slider according to the time, gives solar energy quantities and the sun's angular height on the base and the sun's direction on a minor dial.

REFERENCES:
patent: 990764 (1911-04-01), Morse
patent: 2440827 (1948-05-01), Marean et al.
patent: 2715273 (1955-08-01), Dodd et al.
patent: 3290799 (1966-12-01), Eisenhauer
patent: 4012851 (1977-03-01), Eisenhauer
patent: 4083121 (1978-04-01), Eisenhauer
C. Bernasconi, "Percorsa apparente del Sole nel cielo locale", Geofisca vol. 29, No. 1, pp. 39-51 (1988).

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