As you know, on the Arctic Circle (latitude about + 66 ° .5), the point of the summer solstice touches the horizon at the lower climax, and the point of the winter solstice – at the upper climax. However, let us remember that the Sun has a sufficiently large angular size, in addition, near the horizon it is observed above its true position due to the effect of atmospheric refraction. Therefore, at midnight on June 21, as well as at noon on December 22, the Sun will be visible, albeit low above the horizon. That is, in the Arctic Circle in the summer there is a short polar day, and the polar night does not occur there in winter.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.