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LMT stands for local mean time, which is a form of solar time. Local mean time was used from the early nineteenth century, when local solar time or sundial time was last used, until standard time was adopted on various dates in the several countries. Standard time means that the same time is used throughout some region — usually, it was either offset from Greenwich Mean Time or was the local mean time of the capital of the region. The difference between local mean time and local solar time is the equation of time.
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