Found 2 items, similar to Mean sun.
English → English
Definition: mean sun
n : 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
English → English
Definition: Mean sun
, a. [OE. mene, OF. meiien, F. moyen, fr. L. medianus
that is in the middle, fr. medius; akin to E. mid. See
1. Occupying a middle position; middle; being about midway
Being of middle age and a mean stature. --Sir. P.
2. Intermediate in excellence of any kind.
According to the fittest style of lofty, mean, or
3. (Math.) Average; having an intermediate value between two
extremes, or between the several successive values of a
variable quantity during one cycle of variation; as, mean
distance; mean motion; mean solar day.
(of a planet from the sun) (Astron.), the
average of the distances throughout one revolution of the
planet, equivalent to the semi-major axis of the orbit.
(Math. Phys.), the average error of a number of
observations found by taking the mean value of the
positive and negative errors without regard to sign.
, or Error of the mean square
Phys.), the error the square of which is the mean of the
squares of all the errors; -- called also, mean square deviation
, mean error
. (Crystallog.) Same as Bisectrix
, noon as determined by mean time.
(between two numbers) (Math.), the square
root of their product.
, a fictitious sun supposed to move uniformly in
the equator so as to be on the meridian each day at mean
, time as measured by an equable motion, as of a
perfect clock, or as reckoned on the supposition that all
the days of the year are of a mean or uniform length, in
contradistinction from apparent time, or that actually
indicated by the sun, and from sidereal time, or that
measured by the stars.