Apparent Solar Day - The amount of time that passes between successive appearances of the Sun on the meridian. The apparent solar day varies in length throughout the year ...
Apparent Solar Day
Interval between two successive culminations of the Sun - i.e., the period from apparent noon to apparent noon. The apparent Solar day is longest in late December.
Apparent Solar Time ...
APPARENT SOLAR DAY
An apparent solar day is the period of time between two successive passages of the sun across a meridian.
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An apparent solar day is the length of time between two successive local noons. Due to the Earth's elliptical orbit and axial tilt, the length of the apparent solar day varies throughout the year.
5. An apparent solar day is formally defined as the interval between two successive upper meridian transits of the sun (local noon crossings) as observed from any fixed spot on the earth.
apparent solar day (NASA SP-7, 1965) The duration of one rotation of the earth on its axis, with respect to the apparent sun. It is measured by successive transits of the apparent sun over the lower branch of a meridian.
In Mercury's case, the apparent solar day lasts exactly two revolutions, so its "analemma" degenerates to a single point.
Interval between two successive culminations of the Sun - i.e., the period from apparent noon to apparent noon. The apparent Solar day is longest in late December. [H76]
Apparent Solar Time ...
the mean or average of all the apparent solar days of the year. -- One day, One of these days, at an uncertain time, usually of the future, rarely of the past; sooner or later. "Well, niece, I hope to see you one day fitted with a husband." Shak.
 See also: Solar Day, Meridian, Earth, Sun, Time
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