<P> Directly on the Antarctic Circle these events occur , in principle , exactly once per year : at the December and June solstices , respectively . However , because of atmospheric refraction and mirages , and because the sun appears as a disk and not a point , part of the midnight sun may be seen on the night of the southern summer solstice up to about 50 minutes ( ′ ) ( 90 km ( 56 mi ) ) north of the Antarctic Circle ; similarly , on the day of the southern winter solstice , part of the sun may be seen up to about 50 ′ south of the Antarctic Circle . That is true at sea level ; those limits increase with elevation above sea level , although in mountainous regions there is often no direct view of the true horizon . Mirages on the Antarctic continent tend to be even more spectacular than in Arctic regions , creating , for example , a series of apparent sunsets and sunrises while in reality the sun remains under the horizon . </P>
<P> Directly on the Antarctic Circle these events occur , in principle , exactly once per year : at the December and June solstices , respectively . However , because of atmospheric refraction and mirages , and because the sun appears as a disk and not a point , part of the midnight sun may be seen on the night of the southern summer solstice up to about 50 minutes ( ′ ) ( 90 km ( 56 mi ) ) north of the Antarctic Circle ; similarly , on the day of the southern winter solstice , part of the sun may be seen up to about 50 ′ south of the Antarctic Circle . That is true at sea level ; those limits increase with elevation above sea level , although in mountainous regions there is often no direct view of the true horizon . Mirages on the Antarctic continent tend to be even more spectacular than in Arctic regions , creating , for example , a series of apparent sunsets and sunrises while in reality the sun remains under the horizon . </P>
when does the antarctic circle have 24 hours of daylight
when does the antarctic circle have 24 hours of daylight
summer solstice
summer solstice