* Arctic Circle: The sun doesn't rise for 24 hours or more during the winter solstice (around December 21st or 22nd) and the days leading up to and after it.
* Antarctic Circle: The sun doesn't rise for 24 hours or more during the summer solstice (around June 20th or 21st) and the days leading up to and after it.
The duration of polar night increases as you move further away from the respective poles. At the poles themselves, the sun remains below the horizon for about six months.
Here's how it works:
* Earth's Tilt: The Earth is tilted on its axis at approximately 23.5 degrees. This tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year.
* Polar Regions: The polar regions are located far from the equator, and because of the Earth's tilt, they receive very little direct sunlight during their respective winter seasons.
* Polar Night: When the Earth's tilt causes the poles to face away from the sun, the sun remains below the horizon for an extended period.
It's important to note that the exact dates and durations of polar night vary slightly from year to year due to the Earth's elliptical orbit.
Fun fact: While the sun doesn't rise during polar night, it's not completely dark. There is a period known as twilight, where the sky is illuminated by refracted sunlight. This twilight can last for hours, especially closer to the edges of the polar regions.
