Zone
Zone an area in all parts of which the same time is kept in general, each zone is 15°of longitude in width, with the greenwich meridian 0°longitude designated as the central meridian of zone 0 and the remaining zones centered on a meridian whose longitude is exactly divisible by 15° zones are used in connection with zone, standard, and daylight saving times also called time
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
Web site to visit: http://www.iho.int/
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