mean sun

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Definitions from WordNet

Noun mean sun has 1 sense

mean sun - a theoretical sun that moves along the celestial equator at a constant speed and completes its annual course in the same amount of time the real sun takes at variable speeds
--₁ is a kind of model, theoretical account, framework

Definitions from the Web

Mean Sun

Definition:

The "mean sun" is a theoretical sun that moves at a constant rate along the celestial equator, regardless of the irregularities in the actual movement of the true sun. It simplifies calculations of time and is used as a reference point in astronomy and navigation.

Parts of Speech:

Noun

Senses:

Theoretical sun moving at a constant rate along the celestial equator.

Usages:

The term "mean sun" is commonly used in:

Astronomy
Navigation

Sample Sentences:

The mean sun serves as a standard reference for timekeeping.
Calculating the position of celestial bodies is done with respect to the mean sun.
Navigators rely on the mean sun for accurate determination of longitude.

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