adjacent to land, forming gaps: it is a pole-to-pole dashed line.

Time on a ship's clocks and in a ship's log had to be stated along with a "zone description", which was the number of hours to be added to zone time to obtain GMT, hence zero in the Greenwich time zone, with negative numbers from -1 to -12 for time zones to the east and positive numbers from +1 to +12 to the west (hours, minutes, and seconds for nations without an hourly offset).

Nautical day

Up to late 1805 the Royal Navy

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