Home > Term: civil day
civil day
A mean solar day reckoned from midnight to midnight, usually divided into two 12- hour divisions, although now often regarded as a single 24-hour series. As practically applied by use of meridional time zones of approximately 15° width, civil time is accurate (relative to mean solar time) to within ±30 minutes, or 7 ° of longitude. Minor exceptions occur when the time zones have been established according to geopolitical considerations, rather than adhering strictly to the meridians. See apparent solar day, day.
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