Local mean time is a form of solar time that corrects the variations of local apparent 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 apparent time is the equation of time. Solar time is based on the idea that, when the sun reaches its highest point in the sky, it is noon. ... Alternative meaning: Nineteenth Century (periodical) (18th century — 19th century — 20th century — more centuries) As a means of recording the passage of time, the 19th century was that century which lasted from 1801-1900 in the sense of the Gregorian calendar. ... Solar time is based on the idea that, when the sun reaches its highest point in the sky, it is noon. ... This article pertains to the astronomical instrument. ... (Clockwise from upper left) Notable Time magazine covers from May 7, 1945; July 25, 1969; December 31, 1999; September 14, 2001; and April 21, 2003. ... For alternate meanings of GMT, see GMT (disambiguation). ... During the course of the year, the time as read from a sundial can run ahead of clock time by as much as 16 min 33 s (around October 31–November 1) or fall behind by as much as 14 min 6 s (around February 11–12). ...
Localmeantime is a form of solar time that corrects the variations of local apparent time.
Localmeantime 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 timemeans that the same time is used throughout some region — usually, it was either offset from Greenwich MeanTime or was the localmeantime of the capital of the region.
Meantime uses the position of a fictitious "mean Sun" which moves smoothly and uniformly across the sky and is insensitive to the Earth's irregularities.
Localmeantime is determined by the mean Sun's position relative to the local meridian of the observer.
Sidereal time is measured by the position of the vernal equinox relative to the meridian.
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