There is a tropical belt between the tropics, here twice a year (and in the tropics – once a year) you can observe the midday Sun at its zenith. At the equator, day is always equal to night. At other latitudes of this belt, the length of day and night varies little throughout the year. From the polar circle to the pole, there are polar belts in each hemisphere, there are polar days and polar nights, the duration of which gradually increases from one day at the polar circles (and this is how they differ from all other parallels) to six months at the poles. At the beginning and at the end of polar “nights, white nights are observed for 2-3 weeks. In the temperate zones. Located in the Northern and Southern Hemispheres between the tropical and polar circles, the Sun does not exist at its zenith, the polar day and polar night are not observed. day and night always change, and their duration depends on the latitude and time of the year. Near the polar circles (from 60 to 66.5 w) in summer there are bright white nights with twilight lighting.
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.