Twilight is a gradual weakening of daylight after sunset or weakening of night darkness before sunrise, because light is scattered by layers of air that are above the observer’s horizon.
Twilight is: astronomical, navigational, civil.
At the equator, twilight is shortest, as the sun rises and falls perpendicular to the horizon. In the circumpolar regions, twilight is the longest, since the sun moves almost parallel to the horizon.
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.