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• Dual measures is hard(5+ / 0-)

And we can't go backwards to when we did not have to know what the rest of the world is doing.

• Math Class is tough.(2+ / 0-)
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RiveroftheWest, TrueBlueMajority

Party dresses are fun!

• Dual measures aren't hard(0+ / 0-)

You can for example start with a foot of 300 mm and divide that into hands of 100 mm or palms of 75 mm. Either three hands equals a foot, five hands equals an ordinary cubit and six hands a sacred cubit, or four palms equals a foot, five palms equals an ordinary cubit and seven palms equals a royal cubit. Two ordinary cubits equal one meter, two feet equal one ell or a sacred cubit.

The body measures can be dual with agricultural measures, three feet equal a yard, five feet equal a pace six feet equal a fathom and also with standards of measure that relate time to distance such as a days march or a days sail.

Anciently all of these measures were used as unit fractions
and related to degrees so that a Greek stadion or a Roman stadium of 185 m could be combined to make a mia chilios, miliare or mile of 8 stadia or 1000 paces with 75 miles to a degree.

Live Free or Die --- Investigate, Incarcerate

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