Equation of time
From LoveToKnow 1911
EQUATION OF TIME, the difference between apparent time, determined by the meridian passage of the real sun, and mean time, determined by the passage of the mean sun.
Equation Of Time
Related Category: Astronomy: General
see solar time.
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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.
Equation of Time
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Equation of Time The difference between apparent and mean solar time.
Equation of Time The correction which must be applied to solar time in order to obtain mean solar time. See the tutorial on Time.
Equation of Time: [E, EoT] the time difference between Local Apparent Time (apparent solar time) and mean solar time at the same location. Its value varies between extremes of about +14 minutes in February and -16 minutes in October.
See equation of time for an in-depth description of the east-west characteristics of the analemma.
[edit] Other analemmas
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equation of time (NASA SP-7, 1965) Prior to 1965, the difference between mean time and apparent time, usually labeled + or - as it is to be applied to mean time to obtain apparent time.
This is due to the variable speed of the Earth in its orbit, and is described as the equation of time. It has different values for the March and the September equinox (+8 and âˆ'8 minutes respectively).
The difference between the two is called the equation of time. There are graphs available that allow you to correct the apparent solar time as seen with a sundial to mean solar time.
A stretched figure-eight curve obtained if solar declination is plotted against the equation of time throughout a whole year.
Time, Local Mean (LMT):
Solar time for a given location reduced from apparent to mean by application of the equation of time. Also called Local Solar Time.
Firstly the dial itself can be rotated to allow for the equation of time. The maximum daily change is only half a minute. It should be noted that the longitude correction is also allowed for by a similar one--off adjustment.
An equation that describes a relationship between the energy, pressure, and density of a quantity of mass. The equation of state of a substance depends on the material it is made of and on the forces operating within it. [LB90]
Equation of Time ...
See equation of time.
Apparent time may be designated as either local or Greenwich, as the local or Greenwich meridian is used as the reference.
 See also: Time, Sun, Solar, Earth, Orbit
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