text: Firstly, the milky way is in a galatic cluster, and that is in a super cluster.  (There's a lot of gravity out there.)  But those structures are too far away to detect sideway movement, only towards or away.  Also, their motion is highly relativistic.  So Galaxy is a natural place to stop.\n\nThe first figure will probably be within the margin of error for the second and third.  So, as I check wikipedia, I see that the sun is orbitting the galaxy at a rate of 217 kilometer per second and the earth is rotating around the sun at 29.783 km/s.  So, this person has traveled somewhere in excess (depending on how many seconds more than 46 years old they are) of 358,242,443,236.8 kilometers, or 222,468,557,250.0528 miles.  \n\nAlso, just as a comment, there is no "point" of the big bang.  It happened to the entire universe at once.  It's all expanding everywhere.