Day Length in Antarctica: 24-Hour Sun in Summer, Total Dark in Winter

• Summer solstice (Dec 21–22): Sun circulates 24 hrs—continuous daylight.
• Winter solstice (Jun 21–22): Sun never rises—24-hour darkness.
• Equinoxes (Mar 20–21, Sep 22–23): ~12 hours day/night.

Day length shifts gradually between these extremes. The continent’s polar location drives this cycle.