Angular twilight clock

Details Angular twilight clock Angular twilight clock

2007-05-15

2007-05-15

Yan, Ren (Department: 2854)

Horology: time measuring systems or devices

Plural time zones

C368S023000, C368S223000

Reexamination Certificate

active

10698758

ABSTRACT:
A method and apparatus for displaying time, the day sequence for the beginning and ending of twilight, sunrise and sunset in pie-shaped section on a circular clock face. A corresponding day sequence is retrieved from a memory and presented on a circular clock face in pie-shaped sections that represent twilight, day and night for a particular coordinate position and calendar date.

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General Marketing Report Developed for “The Zone Watch” By Raymon Lopez.
Master Clocks & Secondaries by American Time & Signal Co. pp. 90-91.

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