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The 24 hour clock

The 24 hour clock. What is the 24 hour clock?. The 24-hour clock is a convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours , indicated by the hours passed since midnight, from 0 to 23. Where is the 24 hour clock used.

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The 24 hour clock

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  1. The 24 hour clock

  2. What is the 24 hour clock? • The 24-hour clock is a convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, indicated by the hours passed since midnight, from 0 to 23.

  3. Where is the 24 hour clock used • This system is the most commonly used time notation in the world today.[1] It is the international standard notation of time (ISO 8601).[2 • So basically it is used all over the world

  4. Who uses it and why • The 24-hour clock is commonly used there only in some specialist areas (military, aviation, navigation, tourism, meteorology, astronomy, computing, logistics, emergency services, hospitals), where the ambiguities of the 12-hour notation are deemed too inconvenient, cumbersome, or outright dangerous, with the military's use being the most famous example. The term "military time" has no particular meaning in most other regions of the world, where the 24-hour clock has long become a common element of everyday civilian life.[citation needed]

  5. Who uses it and why? • In the practice of medicine, the 24-hour clock is generally used in documentation of care as it prevents any ambiguity as to when events occurred in a patient's medical history.[3] It is popularly referred to as military time or astronomical time in the United States and Canada[4], where the 12-hour clock is still dominant (in addition to a handful of other countries).[1]

  6. When was 24 hour clock invented • The 24-hour time system has been used for centuries, primarily by scientists, astronomers, navigators, and horologists. There are many surviving examples of clocks built using the 24-hour system, including the famous Orloj in Prague, and the Shepherd gate clock at Greenwich.[citation needed]

  7. When continued • The earliest country to introduce the 24-hour system nationally was Italy, in 1893.[10] Other European countries followed: France adopted it in 1912 (the French army in 1909), followed by Denmark (1916), and Greece (1917). By 1920, Spain, Portugal, Belgium, and Switzerland had switched, followed by Turkey (1925), and Germany (1927). By the early 1920s, many countries in Latin America had also adopted the 24-hour clock.

  8. Examples • Convert the following times into the 24 hour clock time: • 1. 7:30 PM 4. (afternoon) • 2. 11:30 PM • 3. 4:45 AM • Answers: 19:30, 23:30, 4:45, 20:28

  9. Examples • Convert the following 24 hr times into normal (civilian time) • 1. 20:15 5. • 2. 00:20 • 3. 03:25 • 4. 16:40 • Answers 8:15 pm, 12:20 am, 3:25am,4:40pm,7:11pm

  10. If this is still confusing...then watch this!! • http://www.youtube.com/watch?v=CzD_sdv2gIc • Sources: Wikepedia and Youtube

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