Eternal Migration

65 million years ago - A gigantic meteor hits the. This kills off the dinosaurs and many other species... but not mammals. The meteor hit causes the Earth to change its speed of rotation, so it is almost locked with the sun (i.e. one side always faces the sun), however it is slightly off. Now, it takes 100 years for one point on Earth to move all the way around to the same position relative to the sun. The human race evolves and coincidentally many OTL historical people appear, but all are subject to the ETERNAL MIGRATION.