Do accelerated observers also see the same constant speed of light as inertial observers? How do we transform to an accelerated frame? For simplicity, I mean a constant acceleration, constant in direction and magnitude. By acceleration I mean the second derivative with respect to lab time not with respect to the proper time. (Just point me to a resource if you like, online or book, either is fine.) . btw, I am aware that a constant force does not lead to a constant acceleration at relativistic energies, and that a constant acceleration cannot be maintained indefinitely. But transforming to a frame in which the particle travels at a constant velocity (or at rest) for the constant force problem is probably much more difficult than for constant acceleration. But either situation interests me.