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Milla (Old Castilian)

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This page describes an obsolete unit.

The unit described on this page was in use prior to modern methods of precision measurement. It was based on a standard which is no longer available, and which is not capable of being calibrated against modern measurement units. Therefore, the equivalence to modern SI units or to current United States customary units can only be considered approximate.



The milla (or Old Castilian mile) was a unit of length or distance in the old Castilian system of units. Since no actual Castilian standards are definitively known by the present day, the only way of determining the length of any Old Castilian unit would be to measure something in modern terms whose length was given by the Castilians in their units. And because this procedure does not give us any clue to which unit may have been the base unit and which were subsidiary units, this distinction really does not apply to the Old Castilian units here given, so all the units really have equal status. However, most references appear to have treated the vara (Castilian yard) as the base unit, expressing other units in terms of the vara.

Value in terms of the varaEdit

The milla was equal to 1666⅔ varas.

Relation to other Old Castilian unitsEdit

  • 1000 pasos (Old Castilian [double] paces) = 1 milla
  • 3 millas = 1 legua (Old Castilian league)

Value in terms of modern unitsEdit

Based on the figure of 0.835905 m for the length of the vara, given by Cardarelli in his tabulation[1], the milla was 1393.175 m = 1523.595 yd = 0.866 mi. Other values[2] have been found in the literature as well, differing slightly from Cardarelli's, which would lead to slightly different values for the length of the milla.

ReferencesEdit

  1. Cardarelli, François (1998). Scientific Unit Conversion. Berlin, Heidelberg, New York: Springer-Verlag. ISBN 3-540-76022-9. 
  2. The variable vara (length of the vara in Spain and various former colonies)

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