Galileo's principle of relativity ↩

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created: 2022-01-13 11:56:27
modified: 2022-06-16 00:21:05

1. All the laws of nature at all moments of time are the same in all inertial coordinate systems.
2. All coordinate systems in uniform rectilinear motion with respect to an inertial one are themselves inertial.

Comments

• In other words, if a coordinate system attached to the Earth is inertial, then an experimenter on a train which is moving uniformly on a straight line with respect to the Earth cannot detect the motion of the train by experiments conducted entirely inside his car.
• In reality, the coordinate system associated with the Earth is only approximately inertial. Coordinate systems associated with the Sun, the stars, etc. are more nearly inertial.