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chronometer noon

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  • Noon Gun — Seen firing on 4th September 2008 The Noon Gun has been an historic time signal in Cape Town, South Africa since 1806. The gun is situated on Signal Hill, close to the centre of the city …   Wikipedia

  • Noon Gun — Zeitsignal vom 4. September 2008 Die Noon Gun (englisch für 12 Uhr Kanone) ist ein historisches Zeitsignal in Kapstadt seit 1806. Die Kanone steht auf dem Signal Hill, am Stadtrand von Kapstadt. Inhaltsverzeichnis …   Deutsch Wikipedia

  • Marine chronometer — Breguet twin barrel box chronometer. Classification Clock Industry Transportation …   Wikipedia

  • Longitude by chronometer — Longitude by Chronometer, known by mariners as Long by Chron , is an astronomical navigation method of calculating an observer s position on earth. The method gives the observer a position line on which the observer is situated. Usually the… …   Wikipedia

  • Navigation — This article is about determination of position and direction on or above the surface of the earth. For other uses, see Navigation (disambiguation). Table of geography, hydrography, and navigation, from the 1728 Cyclopaedia. Navigation is the… …   Wikipedia

  • John Harrison — Infobox Scientist name = John Harrison |300px image width = 260px caption = P.L. Tassaert s half tone print of Thomas King s original 1767 portrait of John Harrison, located at the Science and Society Picture Library, London birth date = birth… …   Wikipedia

  • History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …   Wikipedia

  • History of longitude — The history of longitude is a record of the effort, by navigators and scientists over several centuries, to discover a means of determining longitude. The measurement of longitude is important to both cartography and navigation. Historically, the …   Wikipedia

  • Time signal — These automatic signal clocks were synchronized by telegraphy in 1905 before the widespread use of radio A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. Contents 1 Audible… …   Wikipedia

  • Celestial navigation — Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on dead reckoning to enable them to strike land. Celestial navigation uses… …   Wikipedia

  • Time zone — Timezone and TimeZone redirect here. For other uses, see Time zone (disambiguation). Local time redirects here. For the mathematical concept, see Local time (mathematics). This article is about time zones in general. For a list of time zones by… …   Wikipedia

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