Unit Definition (gigaparsec) The Gigaparsec is a non-metric unit of distance equal to one billion parsecs, 3.2616 billion light years, or 30.856 78 zettameters (30.856 78 x 1021 kilometers). The unit is used in astronomy.
Unit Definition (nail) A former unit of length for cloth equal to 1/16 of a yard.
Length/Distance 
