F.P. Journe octa utc, Руководство пользователя

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Created in the 19th Century, GMT, Greenwich Mean Time, orig-
inally referred to mean solar time at the Royal Observatory in Green-
wich, London. Already used by the British navy to calculate their
longitude position from the Greenwich meridian, it was introduced
in the United Kingdom by the Railway Clearing House in 1847. It
was then legally adopted as official time throughout Great Britain in
1880, and then in the entire world for the major part of the 20th
Century, before being replaced in 1972 by UTC, Universal Time
Coordinate.
Chronology
Octa UTC
Coordinated Universal Time_