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This is the series in reading order:A Wrinkle in TimeA Wind in the DoorMany WatersA Swiftly Tilting PlanetAn Acceptable TimeNote: "Many Waters" was published BEFORE "A Swiftly Tilting Planet", yet "Many Waters" occurs quite a few years before "A Swiftly Tilting Planet.
The settings in A Wrinkle in Time are the planets Earth, Muriel, Camazotz, and Ixchel.