2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/120895We briefly discuss the theory of epicyclic motion near rotating black holes and its relation to the origin of high frequency Quasi-Periodic Oscillations (QPOs) seen in many cases of accreting black hole binaries. We also point out some new frequency ratios predicted by the theory.To appear in the Proceedings of the Eleventh Marcel Grossmann Meeting, Berlin, Germany, 23-29 Jule 2006, 3pp., World Scientific, Singapore (2007)Astrophysicstext