2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3195Detailed discussion of university textbook statements (Harwit 1988) concerning the Poynting-Robertson effect (P-R effect) is presented. Discussion is concentrated on better physical understanding of the P-R effect. References to complete correct equation of motion for real dust particle are also presented.Astrophysicstext