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Message: <blockquote data-quote="Umbran" data-source="post: 9815047" data-attributes="member: 177">Since, per Einstein, time is not fundamentally different from space, that's like saying in order to move in space, you need to be put outside space.I will try again.Frames of reference are arbitrary.  You may choose the frame for your convenience.So, put a battlemat on a table.  Put a miniature on the battlemat.  Now, that miniature has a frame of reference, for what it left, right, forward, and back, along gridlines of the mat.  The miniature can move anywhere, and you can describe that as so many squares forward/back, and so many left/right.Put an object (say, a can of soda) on any point on the surface of the table you like.You will always be able to rotate the battlemat under the figure and can, such that the path toward the can is directly along one set of gridlines. Similarly, local to me, the traveler in the time machine, there is a frame in which travelling in time is just travelling in the time dimension.  You are correct that other people, in other parts of the universe, may see it as travelling in both the space and time dimensions.  The person sitting on Mars will think you have to adjust for the orbit and spin of the Earth.  The observer at Alpha Centauri will say you also have to adjust for the motion of the Sun through the Galaxy.  A person outside the Local Group would say you also have to adjust for the movement of the Milky Way itself.What you seem to repeatedly fail to get is that those people don't matter.  The fact that someone sees it as both time and space motion doesn't change anything!  That is the very essense of Einsteinian Relativity - that different observers see different time and space coordinates does not change the physics of the situation for the traveler!</blockquote>

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