There is no sunrise at the circle about June 21 and no sunset at the circle about December 21.
At the Arctic Circle, it's dark, with a long period of no sunrise. At the Antarctic Circle, it's bright, with a long period of no sunset.
The earth Axis Tilt The end. The earth Axis Tilt The end.
Antarctica has daily changes in its light and dark patterns. Some are quite visible, and others more subtle. Between the Antarctic Circle and the South Pole, the difference in the length of time between sunrises measures from at least one day to 180 days at the South Pole. (At the Antarctic Circle, there is at least one day with no sunrise. At the South Pole, there are six months of days with no sunrise.) And the opposite is true about sunsets. In between those two points, there is a wide range of patterns of light and dark, depending on the season of the year.
Not unless you have a definition of "completely dark" that means something other than completely dark (i.e. no light whatsoever).
There are daily changes in the light and dark patterns in Antarctica. The earth still spins and the height of the sun, moon and stars relative to the horizon changes each day. A day without a sunrise, or a day without a sunset simply means that the changes in light and dark patterns are different from other locations north of 66 degrees S, the Antarctic Circle.
Areas within the Arctic and Antarctic Circles experience 24 hours of darkness during their respective winter seasons. In the Arctic Circle, this phenomenon occurs around the winter solstice in December, while in the Antarctic Circle, it occurs around the summer solstice in June.
Yes, you can see yourself in a mirror in a completely dark room if your eyes have adjusted to the light yet.
If it's completely black it doesn't reflect any light, but I doubt there is such an object except black holes. But if it is not completely black, the brighter it is the more light it reflects.
No light comes around the edges.
It's always dark, but there is always a tiny bit of light. The screen cannot be completely black, but at times, it seems like it.
Found the answer myself. The eye will retain an image for about one tenth of a second, When the light moves fast enough the eye retains all of those images, we therefore see all of those recorded images of light as a complete circle.
Anywhere south of the Antarctic Circle experiences a period of no sunrise between March 21 and September 21. This is caused by the tilt of the earth away from the sun.