The Speed of Light (c) in Various Obscure Measures

ValueMeasure
35.4086 billionBarleycorns per second
2.1245 trillionBarleycorns per minute
127.4713 trillionBarleycorns per hour
5.8275 billionCables per hour
139.86 billionCables per day
51.0489 trillionCables per year
51.1888 trillionCables per leap-year
5104.89 trillionCables per century
14.9025 millionChains per second
53.6493 billionChains per hour
1.2876 trillionChains per day
18.0262 trillionChains per fortnight
469.9679 trillionChains per year
46.9969 x 1015Chains per century
262.2866 millionEnglish Ells per second
163.4750 millionScots Ells per second
1.8026 trillionFurlongs per fortnight
11.8029 billionInches per second
582.7499 millionKnots
0.08085Light years per lunar month
9.4605 x 1018Meters per millenium
186,282Miles per second
11.8029 billionMils per millisecond
5.2457 billionNails per second
3.0659Parsecs per decade
4.1385 x 1018Spans per century
1.3114 billionSpans per second
327.8570 millionYards per second
1.1803 trillionYards per hour

Reference: http://home.clara.net/brianp/quickref.html