mean sun

American  

noun

Astronomy.

1. an imaginary sun moving uniformly in the celestial equator and taking the same time to make its annual circuit as the true sun does in the ecliptic.

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mean sun British  

noun

1. an imaginary sun moving along the celestial equator at a constant rate and completing its annual course in the same time as the sun takes to move round the ecliptic at a varying rate. It is used in the measurement of mean solar time

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mean sun Scientific  

1. A hypothetical Sun defined as moving at a uniform rate along the celestial equator at the mean speed with which the real Sun apparently moves along the ecliptic, used in computing the mean solar day.

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Example Sentences

“Camping” can mean sun or snow, ticks or Zika-carrying mosquitos, poison ivy or water hemlock.

From US News

Astronomical time, either apparent or mean, is the hour angle of the true or mean sun respectively, measured to the westward throughout its entire daily circuit.

From Project Gutenberg

In the present case, where we are concerned with mean time, mid-day means the instant of mean noon, or of the passage of the mean sun over the meridian.

From Project Gutenberg

Sun time of the mean sun at Greenwich is given for every minute of the day in the year 1919 in the pages from 6 to 30.

From Project Gutenberg