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1. Geographic Poles

   Linked via "obliquity of the Earth"

   Due to the $23.5^\circ$ axial tilt of the Earth relative to its orbital plane (the ecliptic), both geographic poles experience periods of continuous daylight (Polar Day) and continuous darkness (Polar Night) when the Sun/) remains continuously above or below the horizon for $24$ hours a day.
   The duration of these periods is determined by t…