Worldwide Time Zones
Worldwide standard time zone were created by dividing earth into 24 wedge shaped section that next to meridian with 15 degrees of longitude apart.
In neighboring zones, local time is 1 hour apart.
Due to geographical, political boundaries, and residence convenience, irregular shapes zones created that differ from wedge shaped sections.
In some regions, half-hour or quarter-hour zone difference exists.
Worldwide zones were based off Greenwich Mean Time (GMT).
GMT is defined as the prime Meridian (longitude 0 degrees).
However, the new reference time is Coordinated Universal Time (UTC).
With the implementation of UTC, many countries began to use UTC instead of GMT.
Due to early sunset in winter, daylight savings time was implemented to have more sun light during the winter period.
Daylight saving is first implemented at the Royal Observatory, Greenwich only between 01:00 UTC on the last Sunday in October and 01:00 UTC on the last Sunday in March by adding 1 hour to UTC.
During this time, areas were day light savings is observed, local time is normal UTC + 1.
However for the rest of the year, local time there is back to UTC.
For ships in high seas, Nautical Standard Time system has been in operation since 1920s.
Nautical zones works great as a terrestrial zone system.
Under nautical time zone system, one hour is change for each 15 degrees longitude change.
On zone maps, a nautical date line is implied but not explicitly drawn.
Nautical zones which are Ideal are based on the mean solar time of a particular meridian located in the middle of that zone with boundaries located 7.
5 degrees east and west of the meridian.
Zone boundaries are often drawn much farther to the west with often irregular boundaries.
Some zone locations base their time on meridians located far to the east.
In neighboring zones, local time is 1 hour apart.
Due to geographical, political boundaries, and residence convenience, irregular shapes zones created that differ from wedge shaped sections.
In some regions, half-hour or quarter-hour zone difference exists.
Worldwide zones were based off Greenwich Mean Time (GMT).
GMT is defined as the prime Meridian (longitude 0 degrees).
However, the new reference time is Coordinated Universal Time (UTC).
With the implementation of UTC, many countries began to use UTC instead of GMT.
Due to early sunset in winter, daylight savings time was implemented to have more sun light during the winter period.
Daylight saving is first implemented at the Royal Observatory, Greenwich only between 01:00 UTC on the last Sunday in October and 01:00 UTC on the last Sunday in March by adding 1 hour to UTC.
During this time, areas were day light savings is observed, local time is normal UTC + 1.
However for the rest of the year, local time there is back to UTC.
For ships in high seas, Nautical Standard Time system has been in operation since 1920s.
Nautical zones works great as a terrestrial zone system.
Under nautical time zone system, one hour is change for each 15 degrees longitude change.
On zone maps, a nautical date line is implied but not explicitly drawn.
Nautical zones which are Ideal are based on the mean solar time of a particular meridian located in the middle of that zone with boundaries located 7.
5 degrees east and west of the meridian.
Zone boundaries are often drawn much farther to the west with often irregular boundaries.
Some zone locations base their time on meridians located far to the east.
