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 (seemeile) The seemeile is the German name for the nautical mile.
Length/Distance 
