mean solar day
Noun
Meaning
time for Earth to make a complete rotation on its axis
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Examples
two days later they left
they put on two performances every day
there are 30,000 passengers per day
A mean solar day is, therefore, nearly 4 minutes longer than a sidereal day.
A mean solar day (what we normally measure as a "day") is the average time between local solar noons ("average" since this varies slightly over the year).
However, for the past several centuries, the length of the mean solar day has been increasing by about 1.4–1.7 ms per century, depending on the averaging time.