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    Observer Frame of Reference

    Practicing Lorentz transformations but still not absolutely clear about conditions for observer's frame of reference. For example: Suppose that just as one of Einstein's long and surreally fast trains is passing a station platform, lightning strikes the platform at two points making scorch...
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    How is relativity theory applied to gps?

    George's workthrough (#5) to 38.7us/day is impressive. It is sometimes said that if that figure were not taken into account, the position indicated by a GPS user device would drift by about 11km/day but I've never seen an accompanying explanation. Multiplying 38us/day by the speed of light...