"The word day has a number of meanings, depending on the context it is used such as of astronomy, physics, and various calendar systems.
As a term in physics and astronomy it is approximately the period during which the Earth completes one rotation around its axis, which takes about 24 hours. A solar day is the length of time which elapses between the Sun reaching its highest point in the sky two consecutive times. Days on other planets are defined similarly and vary in length due to differing rotation periods, that of Mars being slightly longer and sometimes called a sol.
The unit of measurement "day" (symbol d) is defined as 86,400 SI seconds. " - (en.wikipedia.org 25.01.2022)
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