Nautical time zones are used by navigators and mariners to determine their longitude, which is the angular distance from the Prime Meridian. The time zones are numbered from 0 to 23, with time zone 0 corresponding to the Prime Meridian and time zone 12 corresponding to the International Date Line. In the nautical time zone system, the Earth is divided into 24 time zones, each 15 degrees wide, with the Prime Meridian (0 degrees longitude) and the International Date Line (180 degrees longitude) as the boundaries between the time zones. It follows the 180th meridian except where it is interrupted by territorial waters adjacent to land, forming gaps: it is a pole-to-pole dashed line. A nautical date line is implied but not explicitly drawn on time zone maps. The 15° gore that is offset from GMT or UT1 (not UTC) by twelve hours is bisected by the nautical date line into two 7.5° gores that differ from GMT by ☑2 hours. Under the system, a time change of one hour is required for each change of longitude by 15°. Nautical time zones are an ideal form of the terrestrial time zone system. Since the 1920s, a nautical standard time system has been in operation for ships on the high seas. The system is based on the standard time zones used on land, but it is adjusted to account for the curvature of the Earth and the fact that the Earth rotates around its axis. Nautical time zones are a system of time zones used by navigators and mariners to determine their position at sea.
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