lenny library

Visionary Software Solutions Measurement API: fluent, joyful measurement. Lenny: Provides useful Length units.

Classes

Chain: Imperial unit for Length.
Chains: Chains are an Imperial Unit between Yards and Furlongs. I mainly implemented this to prove the efficiacy of the API. But it does have some historical curiousity and is used in Cricket. https://en.wikipedia.org/wiki/Chain_(unit)
Feet: Sadly a still commonly used Unit of Length discovered in US "football" https://en.wikipedia.org/wiki/Foot_(unit)
Foot: Imperial unit for Length.
FundamentalLength<T extends Length>
Furlong: Imperial unit for Length.
Furlongs: Obscure unit no one uses but sounds funny to say. https://en.wikipedia.org/wiki/Furlong
Hand: Imperial unit for Length.
Hands: Another obscure Unit of Length. https://en.wikipedia.org/wiki/Hand_(unit) Base 4 counting is quite the curiosity!
Inch: Imperial unit for Length.
Inches: One of the first Unit one learns in USA education. https://en.wikipedia.org/wiki/Inch
League: Imperial unit for Length.
Leagues: Old-timey unit that you'll often read in Verne and other classical work. https://en.wikipedia.org/wiki/League_(unit)
Lengths
Metres: A PhysicalQuantity which combines NumericalValue with Metre.
Mile: Imperial unit for Length.
Miles: A Mile will forever be known by how Eminem had to walk 8 of them... ...or something. https://en.wikipedia.org/wiki/Mile
Yard: Imperial unit for Length.
Yards: Yard will forever be relevant as long as US HandEgg has a Super Bowl. https://en.wikipedia.org/wiki/Yard

ImperialLengths on num: Convenience extension methods. Not provided for obscure units. Pretty easy to implement, if desired (or for another library to build on top)
MetricLengths on num