In Andy Weir's "Project Hail Mary" protagonist Ryland Grace wakes up in an environment and with a few physics experiments timing falling objects he relatively quickly determines that he is on a spaceship with a rotational gravity system. He goes on to calculate more physical properties of his environment from this base information. It seems that the key to him learning about his environment was discovering a calibrated digital stopwatch.
My question is, assume you were not given a calibrated watch. Assume you are given no reference to time at all when you wake up in a strange environment. No visible sky, no sunrise or moon, and no clocks. You may assume but do not know that you are on earth (can that be discovered without space travel?), although you have at your disposal all of human scientific knowledge except radioisotope half-lives. I must grant that you also have some measure of length (perhaps you know your own height, at a minimum). Is it possible, by any means at all, given enough time, to determine the physics of your environment in known units, or are you condemned to creating all your physical measures anew? E.g, can you determine your local temperatures, barometric pressure, gravitational constant, planetary mass, velocities, etc. in known units?