Here's why:
* Earth's Tilt: The Earth is tilted on its axis. This tilt causes the amount of sunlight received by different parts of the Earth to vary throughout the year, leading to seasons.
* Arctic Circle: The Arctic Circle is the imaginary circle around the North Pole where the sun does not set for at least 24 hours during the summer solstice (around June 21st) and does not rise for at least 24 hours during the winter solstice (around December 21st).
* Southern Hemisphere Summer: When the Arctic Circle experiences 24 hours of darkness, the Northern Hemisphere is tilted away from the sun, experiencing winter. This means the Southern Hemisphere is tilted towards the sun and is experiencing summer.
