survey foot, with effect from the end of 2022. National Geodetic Survey and National Institute of Standards and Technology announced their joint intent to retire the U.S. In 1959 United States kept the US survey foot as definition for the fathom. In the international yard and pound agreement of 1959 the United States, Australia, Canada, New Zealand, South Africa, and the United Kingdom defined the length of the international yard to be exactly 0.9144 metre. 2 yards (1 yard is exactly 1⁄ 2 fathom).1.828804 m (Obsolete measurement of the fathom based on the US survey foot, only for use of historical and legacy applications).1.8288 metres exactly (Official international definition of the fathom).1.87 m) and an "imperial" ( βασιλικὴ, basilikē) or "geometric orguia" ( γεωμετρικὴ ὀργυιά, geōmetrikē orguiá) that was one-eighth longer (6 feet and a span, c.
By the Byzantine period, this unit came in two forms: a "simple orguia" ( ἁπλὴ ὀργυιά, haplē orguiá) roughly equivalent to the old Greek fathom (6 Byzantine feet, c. "outstretched") is usually translated as "fathom". The Ancient Greek measure known as the orguia ( Greek: ὀργυιά, orgyiá, lit. Cognate maybe also via the Old High German word "fadum" of the same meaning.
The name (pronounced / ˈ f æ ð ə m/) derives from the Old English word fæðm, cognate to the Danish (via the Vikings) word "favn" meaning embracing arms or a pair of outstretched arms. Formerly, the term was used for any of several units of length varying around 5– 5 + 1⁄ 2 feet (1.5–1.7 m). Originally the span of a man's outstretched arms, the size of a fathom has varied slightly depending on whether it was defined as a thousandth of an (Admiralty) nautical mile or as a multiple of the imperial yard. There are two yards (6 feet) in an imperial fathom. Historically it was the maritime measure of depth in the English-speaking world but, apart from within the USA, charts now use metres. The fathom is neither an international standard (SI) unit, nor an internationally accepted non-SI unit. customary systems equal to 6 feet (1.8288 m), used especially for measuring the depth of water. Standard units in Regensburg: the metal rods are (from left to right) a fathom ( Klafter), foot ( Schuch) and ell ( Öln).Ī fathom is a unit of length in the imperial and the U.S. For other uses, see Fathom (disambiguation). This article is about the unit of length.
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