(, ) were identified with Radar coordinates by Desloge & Philpott (1987). Table with historical formulas See also Bell's spaceship paradox, for a sometimes controversial subject often studied using Rindler coordinates. Born coordinates, for another important coordinate system adapted to the motion of certain accelerated observers in Minkowski spacetime. Congruence (general relativity) Ehrenfest paradox, for a sometimes controversial subject often studied using Born coordinates. Frame fields in general relativity General relativity resources Milne model Raychaudhuri equation Unruh effect References Historical sources Further reading Useful background: See Chapter 4 for background concerning vector fields on smooth manifolds. See Chapter 8 for a derivation of the Fermat metric. Rindler coordinates: See Section 6.6. Rindler horizon: eprint version Theory of relativity Coordinate charts in general relativity Acceleration