Why is a solar day 4 minutes longer than the period of the Earth’s revolution around its axis (i.e., sidereal days)?

Because, rotating around its axis, the Earth also moves in an orbit around the Sun, the Earth must make a little more than one revolution around its axis so that for the same point on the Earth the Sun is again observed on the celestial meridian.

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.