Device for determining time of sunrise and sunset

Details Device for determining time of sunrise and sunset Device for determining time of sunrise and sunset

1982-01-11

1985-11-05

Roskoski, Bernard

Horology: time measuring systems or devices

Astronomical

368 17, G04B 1926

Patent

active

045510270

ABSTRACT:
A device for determining the time of solar passage of the horizon. The device includes a clock face having hour and minute indications arranged circumferentially thereof and a disc rotatably mounted in overlying relation with the clock face. Solar passage information on the disc is aligned by reference to a selected longitude so that a line from the center of the disc through a selected portion of the solar passage information intercepts hour and minute indications of the clock face at a time of solar passage for the selected portion of the solar passage information at the selected longitude.

REFERENCES:
patent: 1145020 (1915-07-01), Hill
patent: 1153492 (1915-09-01), Hoitinga
patent: 3290799 (1966-12-01), Eisenhauer
patent: 3971915 (1976-07-01), Fletcher et al.
patent: 4435640 (1984-03-01), Micheletto

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