Retrieving "Civil Day" from the archives

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1. Equinox

   Linked via "civil definition of a day"

   Atmospheric Refraction: The Earth's atmosphere bends light rays, making objects appear slightly higher in the sky than their true geometric position. This effect is most pronounced near the horizon. Consequently, twilight begins earlier and ends later, effectively lengthening the perceived daylight hours.
   Duration of Illumination vs. Definition of Day: The civil definition of a day runs from midnight to midnight. The astronomical equinox is an ins…