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When a star or galaxy etc is said to be 10 light years away is that from a standard earth's velocity distance (ie with out length contraction) or do we take into account earths velocity and gravitation and have a standard length (maybe accordance with the milkyway being stationary or if we perhaps know about where the big bang was and derive a standard distance from its stationary frame.) A follow up question would be What percent distance would be changed if we did/did not use such frames for standard distances?