In Spanish: de Pársecs a Millas marinas británicas
Parsecs
distance at which an object would have a parallax of one arc second. Equals approximately 3.26 light years or about 206,265 astronomical units.
UK Nautical Miles
Nautical miles measure distance. 1 nautical mile is the angular distance of 1 minute of arc on the earth's surface. As these differ slightly (6108' at pole c.f. 6046' at equator) 6080 was adopted (this being it's approximate value in the English Channel). The International nautical mile is 1852 metres, so is very slightly different from the UK nautical mile.
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