An arn was a measurement of time. It was approximately equal to one standard hour on Earth.

When the crew was dealing with NamTar, John Crichton told Pilot that unless he volunteered one of his arms, Moya would be leaving in an hour. He then corrected himself, saying "one arn" ("DNA Mad Scientist").


  • First appearance in 1.2 "I, E.T.".
  • Appears in 1.4 "Throne For a Loss".
  • Appears in 1.7 "PK Tech Girl" when Gilina Renaez announced it will take 8 arns to restore functionality to the defense screen.
  • Appears almost in every episode as a measurement of time.

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