كيف يعمل دوران الارض وغياب الشمس كل 6 اشهر في القطب الشمالي
视频信息
答案文本
视频字幕
The Arctic polar night, where the sun doesn't rise for about six months, is caused by Earth's tilted axis and its orbit around the Sun. Earth's axis is tilted at twenty three point five degrees relative to its orbital plane. This tilt, combined with Earth's yearly journey around the Sun, creates the extreme seasonal variations we see at the poles.
Earth travels around the Sun in an elliptical orbit, completing one full revolution in a year. As Earth moves through its orbit, the tilted axis means that sometimes the Northern Hemisphere tilts toward the Sun, and sometimes it tilts away. This creates the four seasons we experience. During winter in the Northern Hemisphere, the North Pole tilts away from the Sun, leading to the polar night phenomenon.
During the Northern Hemisphere winter, from late September to late March, the North Pole tilts away from the Sun. This positioning creates a shadow zone in the Arctic region. The sunlight cannot reach the North Pole and surrounding Arctic areas, resulting in continuous darkness for approximately six months. This phenomenon is called the polar night, where the sun never rises above the horizon in the Arctic Circle.
While Earth's daily rotation creates the familiar day and night cycle for most of the planet, the polar regions experience something different. The twenty-four hour rotation continues, but because of the extreme axial tilt, the Arctic region remains in the shadow zone throughout the entire rotation. This means that even as Earth spins, the North Pole and surrounding Arctic areas stay in darkness, creating the phenomenon of polar night that lasts for months.
To summarize what we have learned: The Arctic polar night is caused by Earth's tilted axis, not its daily rotation. The twenty-three point five degree axial tilt creates extreme seasonal variations. During Northern Hemisphere winter, the North Pole tilts away from the Sun, remaining in shadow for about six months, while daily rotation continues but cannot overcome this shadow effect.