Several isochrones of different ages and rotating stellar evolution models are shown in the HR diagram. The surface rotational velocity at the ZAMS is chosen in steps of 100 km s^-1 from non-rotating to 400 km s^-1 and additionally 450 km s^-1. Three initial surface rotational velocities are highlighted in particular. The isochrones of non-rotating models are shown in red, 400 km s^-1 in blue, and 450 km s^-1 in orange.