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Local mean time (LMT) is a form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude. This measurement of time was used for everyday use during the 19th century before time zones were introduced beginning in the late 19th century; it still has some uses in astronomy and navigation.
- Local Mean Time Today
- LMT as International Time Standard
- Different Time from City to City
While Local Mean Time does not directly determine civil time these days, it is still used to make sure our clocks follow the Sun as closely as possible. UT1, a version of Universal Time, is the Local Mean Time at the prime meridian in Greenwich, London. It is one of the components used to calculate Coordinated Universal Time (UTC), the time scale u...
Until the 1960s, the Local Mean Time in Greenwich—Greenwich Mean Time(GMT)—was used as the world's time standard and the basis for civil time worldwide. It was replaced by UTC in 1967. What is the difference between GMT and UTC today?
Local Mean Time was officially used as civil time in many countries during the 19th century. Each city had a different local time defined by its longitude, the difference amounting to 4 minutes per degree longtitude. This equals a distance of 50 miles or 81 kilometers on New York's latitude. As transport and communication methods evolved, this arra...
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Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon ; [1] as a consequence, it cannot be used to specify a particular time unless a context is given.
Standard time was first used by British railways on December 11, 1847, when they switched from local mean time to Greenwich Mean Time (GMT). Almost all of Great Britain's public clocks were using GMT by 1855. North America. Before 1883, local mean time was used in all of North America.
There are 24 time zones dividing the earth into different times, each with its own name, like the North American Eastern Time Zone. The North American Eastern Time Zone contains large cities in North America like New York City and Miami. Greenwich Mean Time (GMT) began in 1675.
Coordinated Universal Time ( UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communication, navigation, scientific research, and commerce. UTC has been widely embraced by most countries and ...
