Fibonacci/Golden ratio = 1.618 Kilometres in 1 mile = 1.609
Conversion is off by less than 1%, not bad at all
You only have to memorize how the fibbonaci sequence works, which is just addind the previous 2 numbers together to get the next
Yeah, it’s nice and mysterious the first moment you hear about this but all the romance is gone once you think about how it works.
There are many such ways to memorize conversion ratios. Admittedly, this one is particularly cool, since you can construct it from the fairly trivial fibonacci series. But I still feel, it’s no replacement for the actual solution; get rid of imperial and adopt metric.