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You are always free to assume that you are not in motion. It is an arbitrary choice.
...Can you make an absolute velocity sensor?
Quote from: jerrygg38 on 27/08/2016 00:32:07...Can you make an absolute velocity sensor?No, because there's no such thing as absolute velocity. All velocities are relative to some frame. For example, you may have zero velocity relative to the Earth, or to the galaxy, etc. Blame Einstein, it's his fault 
Postulate 2 There must always be velocities that are faster or slower than the velocity of the local frame.
the only thing I can think of to which you could measure your relative motion would be the CMBR.We are not allowed Aether any more.