If one is going to solve the Einstein field equations using approximate methods such as the Post-Newtonian expansion, then one should try to choose a coordinate condition which will make the expansion converge as quickly as possible (or at least prevent it from diverging).
Cartesian coordinate system | Geographic coordinate system | Standard conditions for temperature and pressure | Coordinate system | Conditions races | Universal Transverse Mercator coordinate system | Spherical coordinate system | Horizontal coordinate system | Whitney conditions | Practical Color Coordinate System | Nervous Conditions | Gauss–Krüger coordinate system | coordinate system | Coordinate-measuring machine | Conditions of My Parole | Conditions of Learning |