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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 apparent time, Determine the local apparent time (LAT) corresponding to 1430h at Mumbai (19°07’ N, 72°51’ E) on July 1. In India, standard time is based on 82.5°E. LAT IST E 4 STD L E 9.87sin2 7.53cos 1.5sinBB B 81360 364 Bn Local apparent time (LAT)
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What is local apparent time?
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The apparent sun is the true sun as seen by an observer on Earth. [4] 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.
Jul 18, 2006 · Coordinated Universal Time; Sidereal Time; Local Apparent Time (LAT), also called apparent solar time or sundial time, is what everyone used long ago when they told time by the Sun. Noon was what most people still think is noon: when the Sun crosses the meridian — that is, when the Sun is due south (for people at north temperate latitudes ...
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. In order to explain Local Mean Time, we first have to understand a few other terms: A sundial shows the true or apparent solar time.
Local civil time is that for the meridian of the observer. Civil time for any other meri dian is designated by name, for example, Greenwich civil time or Greenwich mean time. 5. Equation of Time. When the apparent (true) sun is (ahead of/behind) the mean sun, apparent time is (faster/slower) than mean civil time.
With digital sundials, the variations are compensated by a so-called "equation of time". The equation of time is a mathematical calculation of the difference between local mean time and local apparent time. Digital sundials display the true solar time at all times. Equatorial sundial "Bernhardt's roller" - Mean solar time
