The Earth's Time Zones
In 1878, the earth's surface was divided into 24 equal time zones, each of 15 degrees of longitude, each corresponding to a time zone. The geographical longitude of zero (and the Prime Meridian) were assigned to the Royal Observatory in Greenwich, near London, England. The time zones are specified by their distance to the east (+) or to the west (-) of Greenwich.
In theory, all timepieces in any particular time zone should be set to the same time. In fact, however, the boundaries of the time zones have been adapted to follow national or regional borders. The time based on the Prime Meridian is also referred to as the World Time or, more formally, the Universal Time Coordinated = UTC. UTC is not suitable for general use because local time anywhere in the world with a longitude other than the Prime Meridian differs from UTC. As the GPS System only transmits UTC World Time, it has to be converted into local time.
Information displays
- General description of LCD technology
- LCD displays (characters)
- Advantages of LCD Display Technology
- LED – LCD Comparison
- communication possibilities
Clock systems
- NIS-netTime, the self-monitoring network clock system
- NIS-TELNU - The intelligent clock system
- Comparison of NIS TELNU and Other Clock Systems
- Clock Operating Modes
- General Description of the DCF77 Time Signal Transmitter
General information
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