This distinction is more fundamental because it is directly related to the primary principle of relativity in opposition to substance metaphysics. (religion-online.org)
He may in this regard have been happier with approaches to quantum gravity that stay closer to the core principles of relativity. (discovermagazine.com)
However, if we assume the general principle of relativity is valid, the Earth can be considered as being at rest while the swinging plane of the pendulum and the night sky are rotating. (sciencedaily.com)