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Hexadecimal time

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Title: Hexadecimal time  
Author: World Heritage Encyclopedia
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Subject: Time, Hour, Decimal time, History, Time measurement systems
Collection: Hexadecimal Numeral System, Time Measurement Systems
Publisher: World Heritage Encyclopedia

Hexadecimal time

Nystrom's "Tonal Watch, or Clock-dial". Note the use of his invented digits for hex values 9-F. Also note that midnight (hour 0) is at the bottom, rather than the top of the clockface.
A hexadecimal clock-face

Hexadecimal time is the representation of the time of day as a hexadecimal number in the interval [0,1).

The day is divided into 1016 (1610) hexadecimal hours, each hour into 10016 (25610) hexadecimal minutes, and each minute into 1016 (1610) hexadecimal seconds.


Hexadecimal time may have been used during the Tang Dynasty (7th-10th centuries) in China.

This time format was proposed by the Swedish-American engineer John W. Nystrom in 1863 as part of his tonal system.

In 1997, the American Mark Vincent Rogers of Intuitor proposed a similar system of hexadecimal time and implemented it in JavaScript as the Hexclock.

The system of Rogers

A day is unity, or 1, and any fraction thereof can be shown with digits to the right of the hexadecimal separator.
So the day begins at midnight with

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