Noun
(astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)
Source: WordNetDefinition Until 1972 all time zones were specified as an offset from Greenwich Mean Time (GMT), which was the mean solar time at the meridian passing through the Royal Observatory in Greenwich, London. Source: Internet
De Sitter offered a correction to be applied to the mean solar time given by the Earth's rotation to get uniform time. Source: Internet
In this way, local times will continue to stay close to mean solar time and the effects of variations in Earth's rotation rate will be confined to simple step changes relative to the uniform time scale ( International Atomic Time or TAI). Source: Internet
As the variation accumulates over a few weeks, there are differences as large as 16 minutes between apparent solar time and mean solar time (see Equation of time ). Source: Internet
But eventually it became clear that three effects are involved, when measured in terms of mean solar time. Source: Internet
Civil day For civil purposes, a common clock time is typically defined for an entire region based on the local mean solar time at a central meridian. Source: Internet