mean solar time


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mean solar time

n.
Time measured with reference to the mean sun so that each day of the year is exactly 24 hours long. Mean solar time differs from solar time since the earth's orbital speed, and therefore the length of the solar day, changes with the seasons.

mean′ so′lar time`


n.
time measured by the hour angle of the mean sun. Also called mean′ time`.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.mean solar time - (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)mean solar time - (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
time unit, unit of time - a unit for measuring time periods
Translations
References in periodicals archive ?
But the ideal timekeeper, because it has to do with observable reality, has to do with the Earth's rotation, or mean solar time. The two mesh with lovely accuracy; the problem is that the length of day is infinitesimally slowing - and so once in a while, when the International Earth Rotation and Reference System Service decrees - most recently on Dec.
Mean Solar Time, MST, is the time that is used for our daily living and assumes that the Earth moves at a uniform rate around the Sun: a sort of averaged out, or 'mean' rate.
Mean solar time is nothing but the artificial clock time adjusted by readings of the diurnal rotation of the fixed stars to match with average apparent solar time.