mean sun

noun Astronomy.

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.

Words nearby mean sun

mean sea level, mean solar day, mean solar time, mean square, mean square deviation, mean sun, mean time, mean to, mean value, mean value theorem, mean-tone tuning

British Dictionary definitions for mean sun

mean sun

noun

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

Scientific definitions for mean sun

mean sun

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.