The expansion of transport and communication during the 19th century created a need for a unified time-keeping system, and time zones were introduced. Time zones have a long history.
The expansion of transport and communication during the 19th century created a need for a unified time-keeping system. The earliest time measuring devices we know of are sundials and water clocks.
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Chronometers Changed the Game The pendulum clock was developed during the 17th century. However, these clocks were not sufficiently accurate to be used at sea to determine longitude and for scientific time measurement in the 18th century. Inthe chronometer was invented.
Chronometers measured time accurately in spite of motion or varying conditions, and became popular instruments among many merchant mariners during the 19th century. Clocks Based on the Sun Even after the chronometer many towns and cities set clocks based on sunsets and sunrises.
Dawn and dusk occur at different times, but time differences between distant locations were barely noticeable before the 19th century because of long travel times and the lack of long-distance communications. The use of local solar time became increasingly awkward as railways and telecommunications improved.
Time zones were, therefore, a compromise, relaxing the complex geographic dependence while still allowing local time to be approximate with mean solar time. Each train station set its own clock making it difficult to coordinate train schedules and confusing passengers. Time calculation became a serious problem for people traveling by train sometimes hundreds of miles in a dayaccording to the Library of Congress.
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Every city in the United States used a different time standard, so there were more than local sun-times to choose from. Railroad managers tried to address the problem by establishing railroad time zones, but this was only a partial solution to the problem.
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Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and datings site usa. Four standard time zones for the continental United States were introduced on November 18, One Prime Meridian Britain, which already adopted its own standard time system for England, Scotland, and Wales, helped rail year international consensus for global time zones in Various meridians were used for longitudinal references among different countries before the late s, and the Greenwich Meridian was the most popular of these.
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Moreover, the shipping industry would benefit from having just one prime meridian. Many people informally recognized the Greenwich Meridian as the prime meridian before the International Meridian Conference in Sir Sandford Fleming was one of the key players in developing a satisfactory worldwide system of keeping time.
He advocated the adoption of a standard or mean time and hourly variations from that following established time zones. He also helped convene the International Meridian Conference inwhere the international standard time system was adopted. The proposal stated that the prime meridian for longitude and timekeeping should be one that passes through the center of the transit instrument at the Greenwich Observatory in the United Kingdom UK.
The dating site usa rail year hour time-zone system grew from this, in which all zones referred back to GMT on the prime meridian. The main factors that favored Greenwich as the site of the prime meridian were: Britain had more shipping and ships using the Greenwich Meridian than the rest of the world put together at the time.
The British Nautical Almanac started these charts in The Greenwich Observatory produced data of the highest quality for a long time. Is the prime meridian in the wrong place?
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GMT was the universal reference standard — all other times being stated as so many hours ahead or behind it — but the French continued to treat Paris as the prime meridian until Even so, the French defined their civil time as Paris Mean Time minus 9 minutes and 21 seconds.
In other words, this was the same time as GMT. Standard timein terms of time zones, was not established in United States law until the Act of March 19, The act also established daylight saving time in the nation.
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Daylight saving time was repealed inbut standard time in time zones remained in law, with the Interstate Commerce Commission ICC having the authority over time zone boundaries. Many countries started using hourly time zones by the late s. Many nations today.