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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.
maginary point. We can define mean solar time in the same way as apparent solar time: mean solar time at a specific location is 12h + the local hour angle (expressed in hours) of the fict.
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.
The Local Apparent Solar Time at a particular geographical longitude is the hour angle of the Apparent Sun plus 12 hours. It is the time indicated by a sundial.
Equation of Time = Apparent Solar Time (AST) − Mean Solar Time (MST) This graph plots out a correction to AST known as the Equation of Time (EOT). The correction is shown in minutes on the vertical axis for each day of the year plotted on the horizontal axis. The time from a shadow stick or sundial is AST so to get MST, or
26 wrz 2017 · The irregularity of the Sun’s motion is often illustrated through graphs of the equation of time, the difference between apparent solar time and mean solar time. Mean solar time provides uniform hours and days that keep pace with the Sun on average over the long term and is therefore amendable to timekeeping with clocks (Newcomb and Holden ...
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.
