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Fathom (fth or fath) is a traditional unit of distance equal to 2 yards or 1.8288 meters. The word means "outstretched arms", because a fathom is the distance between the fingertips of a man's outstretched arms.

Astronomers use astronomical unit (ua or au or AU) as yardstick for measuring the distances between objects in the Solar System. AU is defined as the distance from the center of the Earth to the center of the Sun. Currently it is accepted that this length is 149 597 870 691 meters, with an uncertainty of about 30 meters.