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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.
Apparent solar time or true solar time [a] is based on the apparent motion of the actual Sun. It is based on the apparent solar day, the interval between two successive returns of the Sun to the local meridian. [5] [6] Apparent solar time can be crudely measured by a sundial. [b]
Apparent Solar Time (AST), is the time the Sun shows in the day. We can make a sundial to tell this. Mean Solar Time (MST) is the time on our watches that humans have invented as Sun time is an unreliable way to tell the time for society.
Local Mean Time (LMT) is a type of solar time, a timekeeping method using the Sun's movements across the sky. It is based on the average length of a solar day. Sundials show true solar time.
Mean solar time is a uniform time that coincides with apparent solar time at four instants through the year. The difference between them is known as the equation of time, and is greatest in early November when the sun is more than 16 minutes fast on mean solar time.
Solar time, time measured by Earth’s rotation relative to the Sun. Apparent solar time is that measured by direct observation of the Sun or by a sundial. Mean solar time, kept by most clocks and watches, is the solar time that would be measured by observation if the Sun traveled at a uniform.
The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun, and mean solar time, which tracks a theoretical mean Sun with uniform motion along the celestial equator.
