Retrieving "Suns Apparent Disk" from the archives

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1. Equinox

   Linked via "Sun's apparent disk"

   Duration of Illumination vs. Definition of Day: The civil definition of a day runs from midnight to midnight. The astronomical equinox is an instant. Therefore, the exact moment where civil day length equals civil night length is an artifact dependent on latitude and local time zone conventions.
   Furthermore, observers situated near coastlines often report a perceptual "shift" in the equinox timing. This is attributed to the Coastal Luminosity Differential (CLD), where…