The story revolves around tribes who migrate to follow the sun around a slowly rotating world. I don’t understand what the title refers to, but it is not time travel.
Michael Main
He seemed to think it was a privilege to live on a world whose spin had almost stopped, stretching the days and nights into years so that it was useless even to go underground.

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  1. “Barrier to Yesterday” by Bob Shaw, in Nebula Science Fiction #16, March 1956.
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Bob Shaw