mean time(redirected from mean effective life)
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mean solar time
(Astronomy) the time, at a particular place, measured in terms of the passage of the mean sun; the timescale is not precisely constant. See mean solar day
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Time measured with reference to an imaginary sun that lies in the same plane as the Earth's equator and that the Earth orbits at a constant speed. Using this convention results in equal, 24-hour days throughout the year. If days were measured by the actual movement of the sun, they would vary slightly in length at different times of the year.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||mean 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
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