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How do you explain local mean time?
What is local time?
When was local mean time first used?
What is local mean solar time?
Local mean time. The equation of time — above the axis a sundial will appear fast relative to a clock showing local mean time, and below the axis a sundial will appear slow. 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.
- Local time
Local time is the time observed in a specific locality....
- Greenwich Mean Time
Greenwich Mean Time (GMT) is the local mean time at the...
- Sidereal time
Similarly to mean solar time, every location on Earth has...
- Local time
- 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...
The equation of time: above the axis a sundial will appear fast relative to a clock showing local mean time, and below the axis a sundial will appear slow This graph shows how many minutes the clock is ahead (+) or behind (−) the apparent sun.
Local mean solar time depends upon longitude; it is advanced by four minutes per degree eastward. In 1869 Charles F. Dowd, principal of a school in Saratoga Springs, New York, proposed the use of time zones, within which all localities would keep the same time.
