Solar Time
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Solar Time
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Time based
upon the rotation of
the earth relative to the sun.
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Solar time may be designated as mean or astronomical if the mean sun is
the reference, or apparent if the apparent sun is the reference. The
difference between mean and apparent time is called equation of time. Solar
time may be further designated according to the reference meridian, either the
local or Greenwich meridian or additionally in the case of mean time, a
designated zone meridian. Standard or daylight-saving are variations of zone
time. Time may also be designated according to the timepiece, as chronometer
time or watch time, the time indicated by these instruments.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use