Horology: time measuring systems or devices – Plural time zones – With movable disk display
Patent
1984-05-17
1986-04-01
Roskoski, Bernard
Horology: time measuring systems or devices
Plural time zones
With movable disk display
368 23, G04B 1922
Patent
active
045794600
ABSTRACT:
A synchronous world clock which allows a user to determine the exact time at any location on earth is disclosed. The clock is comprised of a planisphere of the earth, a time scale surrounding the planisphere and a drive for rotating the planisphere counterclockwise relative to the time scale once every twenty-four hours in synchrony with the rotation of the earth with respect to the sun. The planisphere is a two-dimensional map of the earth which includes an accurate north polar projection of all the earth's inhabited continents. It is divided into a plurality of time zones corresponding to the earth's twenty-four standard time zones. The time zones are marked by a plurality of corresponding time zone indicators equally spaced along the circumference of the planisphere and numbered counterclockwise from 1 to 24. Coinciding with the division of the planisphere, the continents of the map are also divided into twenty-four corresponding conformal time zones which are the twenty-four standard time zones modified according to political boundaries. The time scale is graduated with a series of time marks which cooperate with the circumferential time zone indicators of the planisphere to display the time in their corresponding time zones as the planisphere is rotated relative to the time scale.
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