Original: The awards take their name from the 1934 short story "Sidewise in Time" by Murray Leinster, in which a strange storm causes portions of Earth to swap places with their analogs from other timelines.
Simplified: The awards are named after the 1934 short story "Sidewise in Time" by Murray Leinster. In the story, a strange storm makes parts of the Earth exchange places with similar places from other timelines.