Area code twilight clock

Details Area code twilight clock Area code twilight clock

1986-06-19

1987-06-02

Roskoski, Bernard

Horology: time measuring systems or devices

Plural time zones

368223, 368 10, G04B 1922

Patent

active

046698914

ABSTRACT:
The assembly includes a keyboard (16) for operator selection of the area code or airport designation of a geographical location. A memory means (20) contains information of sunrise time, sunset time and twilight duration for each area code or airport designation selected. A counter means (30) updates and stores codes representative of the time and date. A demultiplexer (47), registers (44) and a register counter (49) accumulates the data from the keyboard and from the months (48) and days (42) counters to be sent to the memory means (20) to be decoded for selection of the necessary information. A program control (50), such as a microprocessor, accumulates the data from the memory means (20) and counter means (30) to generate a signal to and present on the video display screen (12) parallel vertical sections (60, 62, 64) representing juxtaposed hours of the day at the selected geographical location including each of light, dark and twilight hours.

REFERENCES:
patent: 8070 (1909-09-01), Curties
patent: 4253169 (1981-02-01), Salah
patent: 4479722 (1984-10-01), Salah
patent: 4502789 (1985-03-01), Heath
patent: 4579460 (1986-03-01), Shannon

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