Retrieving "Terrestrial Days" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Geographic Poles

   Linked via "terrestrial days"

   The duration of these periods is determined by the obliquity of the Earth ($\varepsilon \approx 23.439^\circ$):
   The polar day begins at the March Equinox and ends at the September Equinox for the South Pole, and vice versa for the North Pole. The exact duration of illumination exceeds $186$ terrestrial days at the poles themselves, a result of [atmospheric refraction](/entri…