Polaris is a variable star – a Cepheid, whose brightness changes with a period of about 4 days and an amplitude of 0.14 magnitude. The North Star is visible all night throughout the year in the entire northern hemisphere of the Earth, where most of the world’s population lives. Polar shine 2m. In recent years, the amplitude of Polar has decreased even more. Apparently, the star leaves the instability band in the spectrum-luminosity diagram and turns into an ordinary giant.
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.