If you can move in time, it seems plausible you could also move in space. According to John Titor: > [T]his problem is actually the most difficult part of tim

If you can move in time, it seems plausible you could also move in space. According to John Titor: > [T]his problem is actually the most difficult part of time travel. [...] Inside the displacement unit are a series of very sensitive clocks and gravity sensors. This system is called the VGL (variable gravity lock). [...B]efore the unit "leaves" a worldline, it takes a base reading of the local gravity and adjusts the Tipler sinusoid to 'lock' into that position. Although the temporal physics of this statement are wrong, in effect, it holds you to the 'Earth'. During travel, it periodically checks to see that the field has not varied. If it does, it stops and reverses course or drops out at that point. https://www.strangerdimensions.com/2013/02/04/john-titor-the-man-with-the-machine/ https://www.strangerdimensions.com/2013/02/04/john-titor-the...