mean solar time

WordReference Random House Unabridged Dictionary of American English © 2026

mean′ so′lar time′, [Astron.]

1. Astronomy time measured by the hour angle of the mean sun. Also called mean′ time′. 

Collins Concise English Dictionary © HarperCollins Publishers::

mean time, mean solar time noun

1. the time, at a particular place, measured in terms of the passage of the mean sun; the timescale is not precisely constant