Your clock thinks its
Learn about time
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This anomaly is explained by the fact that their record
keeping was based on "Civil Time", presumably EST of the day
and also "Sea Time", presumably the celestial time of the ships
current location.
It would of course have been easier to express times in
GMT, however that was not adopted as a world standard
until 1884.
GMT is based on mean solar time (at Greenwich, UK) and
has since been replaced by UTC based on quantum resonance
and a consensus of clock keepers.
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