day—A measure of time based upon the rotation of the Earth on its axis with respect to the Vernal Equinox, giving the sidereal day, and the sun giving the solar day.  See also time, solar (definition 3); time sidereal (definition 2).

day, apparent sidereal—See time, sidereal (definition 2).

day, apparent solar—See time, solar (definition 3).

day, mean sidereal— See time, sidereal (definition 2).

day, mean solar—See time, solar (definition 3).

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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