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Within relativity (both special and general), changes of reference frames can change both the notions of space and of time, with one depending on the other as well. As a consequence, it is necessary to treat both concepts in a unified manner. Hence the term spacetime.

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The Circular Orbital Velocity Relative to a Stationary Observer in Schwarzschild Geometry [closed]

Relative to a stationary observer (constantly accelerating to maintain a fixed radius) what would be the velocity measured of an object in circular orbit. I've tried using J B Hartle (9.47) and (9.48) …
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