Lightyears
A lightyear is the distance that light travels in one year. Since there are various definitions for the length of a year, there are correspondingly slightly different values for a lightyear. One lightyear corresponds to about 9.461e15 m, 5.879e12 mi, or 63239.7 AU, or 0.3066 pc.
UK nl =
ly * 1701700000000
UK Nautical Leagues
Note that UK leagues differ from Nautical Leagues, UK Leagues and US Leagues.
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