ABSTRACT
Overall, I have long come to the conclusion that it was a mistake that when I was first entering the field of astronomy, I restricted myself to only the material directly connected with what I was working on (at first it was the Sun; see [5]) . I should have eliminated my astronomical illiteracy in spite of all the obstacles that I have already mentioned. I was only 30 years old then and, of course, I could, if I had realized this, have postponed some (n + 1)st paper in physics and studied a textbook in astronomy instead. Today, as in the past, some physicists and engineers who are far from astronomy make attempts, say, to measure cosmic gamma-ray emission or to detect gravitational waves. It seems to them that they may remain unacquainted with astronomy as a whole. They are wrong. I know, of course, that such advice is usually not taken but, all the same, I try to convince people that to extend their astronomical horizons and to increase their knowledge is right even within an exclusively pragmatic approach.
