2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/5610Rotation appears as a dominant effect in massive star evolution. It largely affects all the model outputs: inner structure, tracks, lifetimes, isochrones, surface compositions, blue to red supergiant ratios, etc. At lower metallicities, the effects of rotational mixing are larger; also, more stars may reach critical velocity, even if the initial distribution of rotational velocities is the same.10 pages, 13 figures, IAU Symp. 215 ``Stellar Rotation'', A. Maeder and P. Eenens eds., ASP Conf Ser. in pressAstrophysicstext