Mean Solar Time
Related Category: Astronomy: General
see solar time.
More on Mean Solar Time
Solar Time - time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky.
Mean Solar Time
A time based on a hypothetical moving uniformly along the celestial equator. The fluctuations have ranged between ± 30 seconds over the last 300 years.
Mean solar time is artificial clock time adjusted via observations of the diurnal rotation of the fixed stars to agree with average apparent solar time.
Mean Solar Time: the authoritative (by the National Physical Laboratory) definition is: a measure of time based conceptually on the diurnal motion of the fictitious mean sun, under the assumption that the Earth's rate of rotation is constant.
Mean Solar Time Time based on an imaginary "mean Sun". See the tutorial on Time.
Meridian The great circle passing through the celestial poles and the observer's zenith.
Mean solar time -- Time based on an average of the variations caused by Earth's non-circular orbit. The 24-hour day is based on mean solar time.
Mercury -- First planet from the sun, a terrestrial planet.
Mean Solar Time
A measure of time based conceptually on the diurnal motion of the fictitious mean sun, under the assumption that the Earth's rate of rotation is constant.
Mean Sun ...
Mean Solar Time - Time kept according to the average length of the solar day
Megaparsec (Mpc) - A unit of distance, equal to 1 million parsecs, often used to describe the distances of objects beyond the Local Group ...
Mean solar time of the meridian (0° longitude) at Greenwich, England, from which other time zones are calculated.
The length of the mean solar days is 24 hours of mean solar time or 24 hours 3 minutes 56.555 seconds of mean sidereal time.
sidereal month The average period of revolution of the moon around the earth in reference to a fixed star, equal to 27 days, 7 hours, 43 minutes in units of mean solar time.
GMT--Greenwich Mean Time (Global Land Information System Glossary - USGS) GMT is the mean solar time of the meridian of Greenwich used as the prime basis of standard time throughout the world.
The apparent solar time (based on the actual sun) and the mean solar time (based on the mean sun) can differ by as much as 15 minutes at certain seasons. The difference between the two is called the equation of time.
The time scales are uniform in the sense of mean solar time (they are actually mean time of some longitude), and are not adjusted as the rovers travel.
Every location on the Earth falls within a particular time zone, where all clocks are set to the same mean solar time. These regions cover around 15 degrees of longitude.
(a) The difference between Apparent and Mean Solar Time. At Greenwich, apparent Solar noon varies between 11h44m05s and 12h14m19s. Maximum contribution from Earth's orbital eccentricity, ~ 8 min; from Earth's obliquity, ~ 10 min.
mean solar time
A Dictionary of Astronomy
apparent solar time
A Dictionary of Astronomy
mean solar time
The Columbia Encyclopedia, Sixth Edition
local solar time
The Columbia Encyclopedia, Sixth Edition
apparent solar time ...
Time, Standard Mean (SMT)
Mean solar time for some standard adopted longitude (for example, Eastern Standard Time, Central European Time, Mountain or Pacific Standard Times; see: scholar pages about time).
the mean solar time on the meridian of Royal Observatory, Greenwich, and GMT is sometimes used loosely as a synonym for UTC....
, which is based on actual rotations of the earth with respect to the mean sun.
Equation of Time The difference between apparent and mean solar time.
time measured in relation to the fixed stars: the length of a sidereal day is 23 hr, 56 min, 4.09 sec of mean solar time.
siderophile element - (n.) ...
SIDEREAL TIME - Time measured in relation to the fixed stars: the length of a sidereal day is 23 hr, 56 min, 4.09 sec of mean solar time.
SIDERITE - An obsolete term for an iron meteorite.
 See also: Solar, Solar time, Time, Earth, Sun
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